Wavelength-based inter-class bandwidth management for optical burst switched networks

Optical burst switching (OBS) is a viable solution to support next generation optical Internet. This paper addresses the problem of inter-class bandwidth management for OBS supporting multi-class services. Bandwidth management should be simple to implement and optimally designed to maximize the network performance. We propose here a wavelength based inter-class bandwidth management approach for optical burst switched networks (OBSN). Three different wavelength allocation schemes are presented respectively. In our schemes, each class of service is endued with a weight according to its importance, which is proportional to the charge on corresponding class of service by the network operator. The static scheme allocates wavelengths based on the weight of class, while the dynamic allocation scheme is based on the weighted traffic load with the help of a traffic predictor. The merit optimized allocation aims to achieve the maximized weighted throughput of the network based on a traffic predictor and a dynamic optimization algorithm. The performance of the proposed three schemes are evaluated and compared by computer simulations, where the weighted loss rate is chosen to be a merit used in performance evaluations. From the viewpoint of the network operator, the merit-based scheme provides the maximized profit since it improves the weighted throughput of the system, which is approved by simulation results.