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The problem of packet scheduling for traffic streams with target outflowprofiles traversing input queued switches is formulated in this paper. Targetoutflow profiles specify the desirable inter-departure times of packets leavingthe switch from each traffic stream. The goal of the switch scheduler is todynamically select service configurations of the switch, so that actual outflowstreams ("pulled" through the switch) adhere to their desired target profilesas accurately as possible. Dynamic service controls (schedules) are developedto minimize deviation of actual outflow streams from their targets and suppressstream "distortion". Using appropriately selected subsets of serviceconfigurations of the switch, efficient schedules are designed, which deliverhigh performance at relatively low complexity. Some of these schedules areprovably shown to achieve 100% pull-throughput. Moreover, simulationsdemonstrate that for even substantial contention of streams through the switch,due to stringent/intense target outflow profiles, the proposed schedulesachieve closely their target profiles and suppress stream distortion. Theswitch model investigated here deviates from the classical switching paradigm.In the latter, the goal of packet scheduling is primarily to "push" as muchtraffic load through the switch as possible, while controlling delay totraverse the switch and keeping congestion/backlogs from exploding. In themodel presented here, however, the goal of packet scheduling is to "pull"traffic streams through the switch, maintaining desirable (target) outflowprofiles.

Packet Scheduling in Switches with Target Outflow Profiles