Guaranteed QoS Synthesis for admission control with shared capacity

Guaranteed QoS Synthesis (GQS) is a distributed measurement-based admission control scheme. It is designed as a simple and scalable approach to providing strong service guarantees using bulk packet congestion marking across a core network region. We describe the operation and performance of GQS, with particular reference to its use for fair resource-sharing between guaranteed traffic and a rate-responsive non-guaranteed class. This analysis includes a detailed simulation study which fully represents the interactions between events at packet and session timescales. Results confirm that GQS provides strong guarantees under normal conditions, is robust to different traffic configurations, and readily recovers from network failure events.