A control loop reduction scheme for wireless process control on traffic light networks

Authors:
Junghoon Lee;Gyung-Leen Park;In-Hye Shin;Choel Min Kim;Sang-Wook Kim
Affiliations:
Dept. of Computer Science and Statistics, Jeju National University;Dept. of Computer Science and Statistics, Jeju National University;Dept. of Computer Science and Statistics, Jeju National University;Dept. of Computer Education, Jeju National University;College of Information and Communications, Hanyang University
Venue:
ICCSA'10 Proceedings of the 2010 international conference on Computational Science and Its Applications - Volume Part III
Year:
2010

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Abstract

This paper designs a loop reduction scheme and measures its performance for the wireless process control application running on the grid-style traffic light network, aiming at improving the response time of the control system. Based on the WirelessHART standard, which assigns a slot to each (sender, receiver) pair according to the routing schedule, the allocation scheme puts all the pairs having no interference to a single slot, reducing the loop length. For further reduction, the classic Dijkstra’s shortest path algorithm is modified such that the number of end-to-end paths starting from the horizontal links and the vertical link, respectively, is almost same. The transmission of the controller, which initiates all message delivery and is the main bottleneck point, will not be blocked. The simulation result demonstrates that the proposed scheme can significantly reduce the control loop length, and the modified path finding algorithm further achieves about 9.8 % improvement, just sacrificing the 3.2 % of transmission success ratio.