Estimator-Based Encoder-Decoder for Reducing Communications Demands in Event-Triggered Networked Control Systems
Abstract
Wireless networks are vital for implementing flexible Networked Controlled Systems (NCS) in distributed applications, yet they introduce sampling errors, delays, and packet losses that can compromise control performance. While emerging communication services such as Ultra-Reliable Low Latency Communications (URLLC) can mitigate these issues, they consume more shared network resources and may not be efficient if the NCS does not manage its transmissions. Event Triggered Control (ETC) addresses this challenge by determining when an update is needed, thereby specifying a Minimum Inter-Event Time (MIET) and Maximum Allowable Delay (MAD) to ensure a prescribed L2 norm condition or robust stability criterion. This paper proposes an Encoder-Decoder (E/D) architecture for NCS that requires that a control signal is transmitted over a wireless link. Instead of sending the original control signal whenever a trigger occurs, this method transmits an error signal produced by the comparison between the original control signal and a locally estimated signal. This estimated signal is assumed to be locally available at the transmitter and receiver to be used as the encoder and decoder, respectively. Assuming that the estimated signal is correlated to the original control signal, the transmitted error has a lower magnitude than the original transmitted signal. As a result, the NCS can guarantee its robust stability criterion while increasing the achievable MIET, thus reducing network resource usage. This approach is validated in a Cooperative Adaptive Cruise Control (CACC) setup, demonstrating an at least 20% improvement in MIET compared to conventional ETC, while maintaining L2 (string) stability and robust performance with fewer transmissions.
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- Authors
- Villamil, A., Casas, J., & Fettweis, G.
- Affiliations
- Vodafone (Germany) (DE)
- Venue
- IEEE Control Systems Letters
- Published
- 2025
- Volume
- 9
- Pages
- 1718-1723
- ISSN
- 2475-1456 (ISSN-L)
- OpenAlex
- W4411336635
- Cited by
- 1
- References
- 20
- Citations by year
- 2025: 1
- FWCI
- 0.37
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- IEEE Control Systems Letters (publishedVersion)
- Funders
- German Research Foundation as part of Germany’s Excellence Strategy—EXC 2050/1 (390696704)
- Cluster of Excellence “Centre for Tactile Internet with Human-in-the-Loop” (CeTI) of Technische Universität Dresden
- Topics
- Physical Sciences › Engineering › Control and Systems Engineering › Stability and Control of Uncertain Systems
- Physical Sciences › Computer Science › Computer Networks and Communications › Age of Information Optimization
- Physical Sciences › Engineering › Control and Systems Engineering › Advanced Control Systems Design
- Keywords
- event-triggered control, networked control systems, encoder-decoder architecture, minimum inter-event time, maximum allowable delay, robust stability, communication resource reduction, cooperative adaptive cruise control, wireless control, ultra-reliable low-latency communication
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