Study On The Differentiated Service And Fairness Of Optical Burst Switching Networks

Optical burst switching (OBS) is a promising solution for all-optical WDM networks. It combines the benefits of optical packet switching and wavelength routing while taking into account the limitations of the current all-optical technology. In OBS networks, the control plane that works in the electrical domain is separated from the optical transport plane in wavelength, and the end-to-end all-optical data transportation is realized by using such techniques as traffic convergence, data burst assembly, one-way resource reservation and etc. High discarding rate is an inherent shortcoming of OBS network, in order to support integrated traffic with differentiated services in OBS networks, a novel differentiated service hybrid (DSH) signaling protocol is proposed, it guarantees the Quality of service (QOS) for real-time traffic and improves resource utilization, and meanwhile, it also supports unreal-time traffic. Then a dynamic control algorithm is proposed to solve the fairness of a slotted OBS ring network, it not only ensures the fairness but also reduces access latency and loss rate by simple operations on cell heads. Above schemes have been verified by simulation.