Abstract
ABSTRACT A reinforcement learning scheme on congestion control in a high-speed network is presented. Traditional methods for congestion control always monitor the queue length, on which the source rate depends. However, the determination of the congested threshold and sending rate is difficult to couple with each other in these methods. We proposed a simple and robust reinforcement learning congestion controller (RLCC) to solve the problem. The scheme consists of two subsystems: the expectation-return predictor is a long-term policy evaluator and the other is a short-term rate selector, which is composed of action-value evaluator and stochastic action selector elements. RLCC receives reinforcement signals generated by an immediate reward evaluator and takes the best action to control source flow in consideration of high throughput and low cell loss rate. Through on-line learning processes, RLCC can adaptively take more and more correct actions under time-varying environments. Simulation results have shown that the proposed approach can increase system utilization and decrease packet losses simultaneously in comparison with the popular best-effort scheme.
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