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WF 2 Q+ is a packet scheduler providing optimal QoS guarantees at a low computational complexity. It allows a fraction of the total link capacity to be reserved to each packet flow to transmit, and it guarantees to each flow the minimum possible deviation with respect to its reserved service over any time interval. WF 2 Q+ has been defined assuming that the set of the packet flows to transmit is fixed and known at system design time. Unfortunately, such assumption is widely violated in manydoi:10.1109/aaa-idea.2005.7 dblp:conf/aaa-idea/Valente05 fatcat:y7tajk7vw5fh7pi3s4x32ccscm