DQS tries to provide granular and scalable QoS guaranteed services to be selected by users according to their QoS requirements and e2e situation. In this paper, a new structure, Differentiated Queueing Services (DQS), is discussed to handle the above issue. With the conventional packet-level QoS mechanisms for the regulated traffic, i.e., buffer admission control plus output schedulers in general, increasing service granularity may inevitably complicate implementation and/or impact scalability since sophisticated output schedulers seem necessary in this case. One weakness of DiffServ is the lack of granularity for QoS guaranteed services, which makes it difficult to cost-effectively support end-to-end (e2e) QoS according to the e2e situation (e.g., path lengths) of applications.
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