On achieving short-term QoS and long-term fairness in high speed networks

We address the problem of short term QoS, caused by unexpected nature of traffic and expectation of high utilization, by using measurement based adaptive bandwidth control. We develop a short term QoS guaranteed scheduler, called short term QoS Deficit Round Robin (SQ-DRR), which adapts the allocated bandwidth to guarantee delay constraints. The major appealing aspect of the scheduler is that it guarantees delay constraint for short term aggregate burst traffic violating pre-contracted descriptors at the same time without losing long term fairness. We then evaluate the scheduler performance with and without admission control scheme under non-stationary long-range dependence traffic. The simulation results indicate that the SQ-DRR performs well in single-hop and multi-hop network under dynamic burst traffic conditions.