A multiclass admission control mechanism for optical burst-switched networks

The emerging multimedia applications require multiservice networks to guarantee quality of Service (QoS). In this paper, we introduce an admission control mechanism for providing differentiated services in optical burst-switched networks (OBS). The proposed mechanism admits bursts of a given service class based on network load and a class-associated parameter. This parameter, referred as load level, differentiates the blocking probability experienced by bursts of each service class. For the proposed mechanism we develop an analytical model. Several scenarios are analyzed by varying the offered load and the number of service classes. In comparison with other similar mechanisms, the proposed mechanism properly differentiates the services in all analyzed scenarios and always provides a lower blocking probability for the high-priority class bursts.