pmqFlow: Design of propagation time measuring QoS system with OpenFlow for process automation

This paper introduces a novel QoS architecture for process automation. The proposed architecture leverages the concept of Software Defined Network. The architecture maintains the real-time communications based on the measured propagation time. It maintains the configurations by detecting and predicting the change of propagation time in addition to queue usage. The authors utilize the OpenFlow with simple extension to measure the propagation time. The extension allows measuring propagation time with intelligent intermediate network equipment rather than changing process automation end-device. It is important requirement to keep the end-device untouched since the devices have small resources and applications are widely prevailed.