Joint power-efficient traffic shaping and service provisioning for metro elastic optical networks

• Published in: Journal of optical communications and networking Vol. 11; no. 12; pp. 578 - 587
• Main Authors: Hadi, Mohammad, Agrell, Erik
• Format: Journal Article
• Language: English
• Published: Piscataway Optica Publishing Group 01.12.2019; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Coefficient of variation; Delay; Delays; Dynamic programming; Energy conservation; Heuristic methods; Modulation; Optical arrays; Optical communication; Optimization; Power consumption; Power demand; Provisioning; Quality of service; Quality of service architectures; Resource allocation; Resource management; Transponders
• ISSN: 1943-0620; 1943-0639; 1943-0639
• DOI: 10.1364/JOCN.11.000578

Considering the time-averaged behavior of a metro elastic optical network, we develop a joint procedure for resource allocation and traffic shaping to exploit the inherent service diversity among the requests for power-efficient network operation. To support the quality of service diversity, we consider minimum transmission rate, average transmission rate, maximum burst size, and average transmission delay as the adjustable parameters of a general service profile. The work evolves from a stochastic optimization problem, which minimizes the power consumption subject to stability, physical, and service constraints. The optimal solution of the problem is obtained using a complex dynamic programming method. To provide a near-optimal fast-achievable solution, we propose a sequential heuristic with a scalable and causal software implementation, according to the basic Lyapunov iterations of an integer linear program. The heuristic method has a negligible optimality gap and a considerably shorter runtime compared to the optimal dynamic programming, and reduces the consumed power by 72% for an offered traffic with a unit variation coefficient. The adjustable trade-offs of the proposed scheme offer a typical 10% power saving for an acceptable amount of excess transmission delay or drop rate.