A New Algorithm for Controlling a Buffer with Time-Varying Arrival Rate
Rasha Fares, M.E. Woodward · International Journal for Infonomics · 2010
Due to the increase in network services including real-time video and audio applications, Quality of Service (QoS) became a crucial issue for today's Internet users.In order to guarantee QoS to diverse Internet services, it is important to employ effective buffer management schemes at Internet routers.Effectively constraining the mean queue length to a specified level is a key QoS requirement.Controlling the size of the buffer is determined by the dynamics of TCP's congestion control.Therefore, controlling a buffer with time-varying arrival rate can be done by controlling the mean delay or the buffer size around a specified level.The aim of this paper is to propose a new adaptive prediction algorithm for Active Queue Management (AQM) that is simple to implement and can maintain the mean queue length around its target.The algorithm has been modified in order to bind the delay at a constant value when the arrival rate varies with time.This paper presents a feedback control strategy that operates on a buffer which incorporates a moveable threshold.An algorithm is developed to control the buffer by dynamically adjusting the threshold, which In turn, controls the effective arrival rate by randomly dropping packets.The feasibility of the model is examined using both theoretical analysis and simulation.