Class-based stabilized virtual buffer-an AQM scheme with stability, fairness and QoS assurance

Abstract

In this paper we present two Active Queue Management (AQM) schemes, called Multi-class Stabilized Virtual Buffer (MSVB) and SVB with In and Out (SIO), to improve the queue stability, fairness and bandwidth assurance for various classes of Internet connections. These AQM schemes are based on our recent SVB concept that was shown to provide better stability compared to prior AQM schemes. The MSVB policy is a generic multi-class AQM mechanism, while the SIO policy is targeted for the Differentiated Service (Diffserv) architecture. We discuss the design and a control-theoretic analysis of the proposed algorithms, and analyze their steady-state as well as transient behaviors. We then compare the performance of the SVB-based controllers with several well known AQM schemes through simulation. The results indicate that the proposed schemes are capable of providing better stability, improved fairness in bandwidth sharing, and high and predictable performance compared to prior AQM mechanisms.