Robust control and rate coordination for efficiency and fairness in ABR traffic with explicit rate marking

Abstract

The problem of ef®ciency and fairness of Available Bit Rate (ABR) traf®c with Explicit Rate (ER) marking is investigated from a control point of view. It is revealed that due to signi®cant uncertainty on time delays in ABR traf®c and strong interaction among switches, ABR traf®c imposes a great challenge to control strategy development. Focusing on robustness of congestion control and asymptotic fairness, we propose a new control strategy that employs robust control to accommodate delay uncertainty and rate coordination for fairness. Interaction between these two control actions leads to a non-standard multi-objective control problem. Overall stability of the system and convergence to fairness are rigorously analyzed. Conditions are presented under which robust stability and convergence are guaranteed. Simulation tests are then performed to demonstrate that a redesign of feedback controllers may become necessary to satisfy these conditions. q

System Identification with Quantized Observations

“…Similar concerns arise in special-purpose networks such as smart sensors, MEMS (micro electromechanical systems), sensor networks, mobile agents, distributed systems, and remote-controlled systems, which have very limited power for communications and whose dataflow rates carry significant costs and limitations. These developments have made the issue of sampling and quantization once again fundamental for theoretical development and practical applications [13,61,80,81,82].…”