TD/sup 2/FQ: an integrated traffic scheduling and shaping scheme for DiffServ networks

The provision of quality of service (QoS) in terms of delay guarantee to real-time applications is a challenging issue in differentiated services (DiffServ) networks. There is a great demand to maintain individual flow's traffic pattern when scheduling aggregated traffic. In this paper, we propose an integrated traffic scheduling and shaping scheme for DiffServ networks. The proposed scheme is called TD/sup 2/FQ (token-driven delay-sensitive dynamic fair queueing). There are two highlights in TD/sup 2/FQ: a new scheduling mechanism-delay-sensitive dynamic fair queueing, and a new colored token approach. Besides the provision of guaranteed delay bound, TD/sup 2/FQ can handle the aggregated traffic shaping and maintain the inter-flow fairness within each traffic class. Theoretical analysis and simulation experiments are also presented. Comparison results demonstrate the advantage of our approach.