Network Recovery: Protection and Restoration of Optical, SONET-SDH, IP, and MPLS
Network Recovery: Protection and Restoration of Optical, SONET-SDH, IP, and MPLS
Mesh-based Survivable Transport Networks: Options and Strategies for Optical, MPLS, SONET and ATM Networking
WDM: North American deployment trends
IEEE Communications Magazine
IEEE Communications Magazine
Differentiated quality of service in survivable WDM mesh networks
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Near optimal routing and capacity management for PWCE-based survivable WDM networks
Photonic Network Communications
P-Cycle and P-Path dynamic hybrid protection strategies based on block probability for WDM networks
Mathematical and Computer Modelling: An International Journal
Differentiated quality-of-recovery in survivable optical mesh networks using p-structures
IEEE/ACM Transactions on Networking (TON)
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We propose a new flexible design approach of protection plans in survivable WDM networks by using protection structures with no predefined shapes in order to maximize the protected working capacity in an end-to-end basis. Previous design approaches of survivable WDM based on Protected Working Capacity Envelope (PWCE) have looked at the optimization problem of maximizing the protected capacity on a link basis, independently of the source and destination nodes of the potential traffic. Moreover, those approaches have only investigated the design problem with pre-configured protection cycles (p- cycles). Our design approach proposed in this paper differs from those previously proposed in two main points: (i) We use pre-configured protection structures (p-structures) with no predefined shapes. By using protection structures with unrestricted shapes, we want to identify the most flexible ones, i.e., those that can provide the highest protected capacity even within constrained spare capacity budget or low network connectivity. (ii) We maximize the availability of the protected capacity on an end-to-end basis rather than on a link basis. This allow us to more efficiently track fluctuation of the traffic in the networks and among nodes. In order to deal with the large solution space, we develop an ILP optimization model, and use an efficient large scale optimization tool called the Column Generation tool (CG). Results show that a design based on unrestricted p-structure patterns is ∼ 10% less capacity redundant, ∼ 15% more reliable, and allow recovery along shorter backup paths compared to the p-cycle based scheme.