The emergence of new network applications is driving network operators to notonly fulfill dynamic bandwidth requirements, but offer various grades ofservice. Degraded provisioning provides an effective solution to flexiblyallocate resources in various dimensions to reduce blocking for differentiateddemands when network congestion occurs. In this work, we investigate the novelproblem of online degraded provisioning in service-differentiated multi-layernetworks with optical elasticity. Quality of Service (QoS) is assured byservice-holding-time prolongation and immediate access as soon as the servicearrives without set-up delay. We decompose the problem into degraded routingand degraded resource allocation stages, and design polynomial-time algorithmswith the enhanced multi-layer architecture to increase the network flexibilityin temporal and spectral dimensions. Illustrative results verify that we canachieve significant reduction of network service failures, especially forrequests with higher priorities. The results also indicate that degradation inoptical layer can increase the network capacity, while the degradation inelectric layer provides flexible time-bandwidth exchange.
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