QoT- and SLA-Aware Survivable Resource Allocation in Translucent Optical Networks

Abstract

Survivability is a critical issue in highcapacity wavelength division multiplexing based optical networks, since even a disruption for a very short time could result in the loss of a large amount of data. Each accepted connection request brings revenue to the network. On the other hand, a service level agreement (SLA) requirement (e.g., 99.9% uptime in terms of availability) is associated with a connection, and a penalty is paid if the requirement is violated. In addition, physical impairments degrade the quality of signals as they traverse along lightpaths. In this paper, the survivable routing and wavelength assignment problem is studied for dynamic traffic in translucent optical networks considering randomly occurring failures of optical fibers and nodes, so that the quality of transmission (QoT) requirement of each connection is satisfied, and the network-level performance metric of total profit is maximized. Two heuristics are developed -the first one aims to allocate resources to each connection to minimize the expected penalty; while the other heuristic prefers to allocate the minimum possible resources to each connection. Simulation results are presented to demonstrate their effectiveness.

Guidelines to SLA modeling and establishment in heterogeneous communications networks

“…An SLA based cloud computing that facilitates resource allocation which takes into account geographical location and the workload of distributed data centres is proposed in [110]. An efficient heuristic algorithm based on dynamic programming and convex optimization is introduced to solve the mentioned resource allocation problem by H. Goudarzi et al [41] and yet there are several articles published in this domain for cloud computing such as [103][120] [42][38][117] [129], for further reading.…”