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Generalized Processor Sharing (GPS) is realized as the most important ideal fluid scheduling discipline in guaranteed QoS networks. The well-known problem of GPS-based rate-proportional servers is the bandwidth delay coupling which leads to inefficient resource utilization. In this paper we introduce the concept of non rate-proportional (or arbitrary) weighting of sessions in GPS systems. Such an approach in a GPS node of network constrained by leaky buckets can handle bandwidth and delay parameters independently, thus allowing better utilization of network resources. Moreover, we show that even under the traditional bandwidth delay coupled system (rate-proportional weighting) it is possible to determine tighter delay bounds of sessions than that of presented in earlier papers. A numerically inexpensive algorithm, which works in any arbitrary weighted GPS system is also presented for computing delay bounds. Besides the analytical work numerical examples are also shown.

Worst-Case Deterministic Delay Bounds for Arbitrary Weighted Generalized Processor Sharing Schedulers