Smoothing delay jitter in networked control systems

Abstract

Delay jitter is a critical factor that must be considered in many real-time applications that require accurate prediction of packet delivery times. Delay jitter can be smoothed by holding packets in a play-back buffer for a certain time called a play-back delay. In this paper, we extensively examine the new scheme that we have proposed in [1] to enhance the prediction of the play-back delay in Networked Control Systems (NCSs). Our newly proposed scheme differs from previous schemes by using the one way delay variation that we have studied its behavior by conducting extensive measurements between fifty strategically located wired and wireless connected hosts. The advantages of our scheme are that it predicts sudden delay spikes, provides a closer approximation to the round trip time (RTT), and exhibits less frequent outliers.