Impairment- and Splitting Splitting-Aware Cloud-Ready Ready Multicast Provisioning in Elastic Optical Networks
Abstract: It is known that multicast provisioning is important for supporting cloud-based cloud applications, and as the traffics from these applications are increasing quickly, we may rely on optical networks to realize high high-throughput throughput multicast. Meanwhile, the flexible-grid grid elastic optical networks (EONs) achieve agile access to the massive bandwidth in optical fibers, and hence can provision variable bandwidths bandwid to adapt to the dynamic demands from the cloud cloud-based based applications. In this paper, we consider all-optical optical multicast in EONs in a practical manner and focus on designing impairment- and splitting splitting-aware aware multicast provisioning schemes. We first study the procedure of adaptive modulation selection for a light-tree, light and point out that the multicast scheme in EONs is fundamentally different from that in the fixed-grid grid wavelength wavelength-division division multiplexing networks. Then, we formulate the problem of impairment impairment- and splitting-aware aware routing, modulation and spectrum assignment (ISa-RMSA) RMSA) for all all-optical optical multicast in EONs and analyze its hardness. Next, we analyze the advantages brought by the flexibility of routing structures and discuss the ISa ISa-RMSA schemes based on light-trees trees and lightlight forests. This paper suggests that for ISa ISa-RMSA, the light-forest-based based approach can use less bandwidth than the light light-tree-based based one, while still satisfying the quality of transmission requirement. Therefore, we establish the minimum lightl forest problem for optimizing a light light-forest in ISa-RMSA. RMSA. Finally, we design several