On the Latency, Rate, and Reliability Tradeoff in Wireless Networked Control Systems for IIoT

Wanchun Liu, Girish Nair, Yonghui Li, Dragan Nesic, Branka Vucetic, H. Vincent Poor

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


Wireless networked control systems (WNCSs) provide a key enabling technique for Industrial Internet of Things (IIoT). However, in the literature of WNCSs, most of the research focuses on the control perspective and has considered oversimplified models of wireless communications that do not capture the key parameters of a practical wireless communication system, such as latency, data rate, and reliability. In this article, we focus on a WNCS, where a controller transmits quantized and encoded control codewords to a remote actuator through a wireless channel, and adopt a detailed model of the wireless communication system, which jointly considers the interrelated communication parameters. We derive the stability region of the WNCS. If and only if the tuple of the communication parameters lies in the region, the average cost function, i.e., a performance metric of the WNCS, is bounded. We further obtain a necessary and sufficient condition under which the stability region is n-bounded, where n is the control codeword blocklength. We also analyze the average cost function of the WNCS. Such analysis is nontrivial because the finite-bit control-signal quantizer introduces a nonlinear and discontinuous quantization function that makes the performance analysis very difficult. We derive tight upper and lower bounds on the average cost function in terms of latency, data rate, and reliability. Our analytical results provide important insights into the design of the optimal parameters to minimize the average cost within the stability region.

Original languageEnglish (US)
Article number9134368
Pages (from-to)723-733
Number of pages11
JournalIEEE Internet of Things Journal
Issue number2
StatePublished - Jan 15 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Information Systems
  • Hardware and Architecture
  • Computer Science Applications
  • Computer Networks and Communications


  • Industrial Internet of Things (IIoT)
  • mission-critical communications
  • performance analysis
  • sensor-actuator network
  • wireless networked control


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