Improving control performance by minimizing jitter in RT-WiFi networks

Quan Leng, Yi Hung Wei, Song Han, Aloysius K. Mok, Wenlong Zhang, Masayoshi Tomizuka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

21 Scopus citations


Wireless networked control systems have received significant attention due to their great advantages in enhanced system mobility, and reduced deployment and maintenance cost. To support a wide range of high-speed wireless control applications, we presented in our prior work the design and implementation of a flexible real-time high-speed wireless communication platform called RT-WiFi. RT-WiFi currently provides up to 6kHz sampling rate and deterministic timing guarantee on packet delivery. While guaranteed delivery latency is essential for networked control, control performance is also impacted by communication jitter and other QoS parameters. To reduce jitter, a flexible network manager is needed to control network-wide scheduling of packet transportation. In this paper, we present an RT-WiFi network manager design and propose efficient solutions for two fundamental RT-WiFi network management problems. To improve control performance in networked control systems, our RT-WiFi network manager is designed to generate data link layer communication schedule with minimum jitter under both static and dynamic network topologies. In order to minimize network management overhead, an efficient data structure called S-tree is invented to manage the communication requests to deal with network dynamics. We have implemented the RT-WiFi network manager, and validated its network and control performance through extensive experiments with a real application.

Original languageEnglish (US)
Title of host publicationProceedings - IEEE 35th Real-Time Systems Symposium, RTSS 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages11
ISBN (Electronic)9781479972876
StatePublished - Jan 14 2015
Externally publishedYes
Event35th IEEE Real-Time Systems Symposium, RTSS 2014 - Rome, Italy
Duration: Dec 2 2014Dec 5 2014

Publication series

NameProceedings - Real-Time Systems Symposium
ISSN (Print)1052-8725


Other35th IEEE Real-Time Systems Symposium, RTSS 2014

ASJC Scopus subject areas

  • Software
  • Hardware and Architecture
  • Computer Networks and Communications


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