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A flexible priority scheme for shared protection to provide availability-guaranteed service in dynamic optical networks

A failure in optical networks can cause tremendous loss in data and revenue. To guarantee the service availability and handle network failures, shared protection is commonly used. One promising shared protection approach has been proposed which introduce relative priorities among connections contending for access to the shared backup paths. In this paper, a novel priority-aware shared protection algorithm is developed, called FPS, for the dynamic connection provision. In FPS, the relative priority between an incoming connection and an existing connection is flexibly determined to maximize the usage of backup wavelengths after ensuring not to violate the SLA-defined availability requirement of the existing connection. We show that the FPS can obtain significant improvements on resource overbuilding ration and blocking probability compared with existing priority-aware shared protection algorithm.