Design of a reliable traffic control system on city area based on a wireless network

Abstract

This paper designs and analyzes the performance of a reliable communication scheme for the traffic control system, which has a grid topology, based on WirelessHart, a newly developed wireless process control protocol. Besides the main communication schedule, additional schedule is defined with a different channel hopping sequence to make a node take an alternative route in the same slot when the channel on the primary path is not clear. Using the split-merge function augmented to the original WirelessHart node operation, the transmission success ratio can be significantly improved on the rectangular path without extending the control loop. The performance evaluation result measured by simulation using a discrete event scheduler demonstrates that the proposed scheme improves the transmission success ratio for 4 × 4 grid by up to 29 % and each split-merge operation can recover almost all channel errors, especially for long hop transmission. © 2009 Springer Berlin Heidelberg.