Wireless Feedback Control with Variable Packet Length for Industrial IoT
Kang Huang, Wanchun Liu, Yonghui Li, Andrey Savkin, Branka, Vucetic

TL;DR
This paper introduces an adaptive wireless control system for industrial applications that optimizes packet length to balance delay and reliability, improving control performance.
Contribution
It proposes a novel variable packet length scheme in WNCSs, formulating an optimal policy considering delay-reliability tradeoff based on system state.
Findings
Derived conditions for optimal packet length policies.
Showed improved control performance with adaptive packet lengths.
Analyzed the delay-reliability tradeoff in wireless control.
Abstract
The paper considers a wireless networked control system (WNCS), where a controller sends packets carrying control information to an actuator through a wireless channel to control a physical process for industrial-control applications. In most of the existing work on WNCSs, the packet length for transmission is fixed. However, from the channel-encoding theory, if a message is encoded into a longer codeword, its reliability is improved at the expense of longer delay. Both delay and reliability have great impact on the control performance. Such a fundamental delay-reliability tradeoff has rarely been considered in WNCSs. In this paper, we propose a novel WNCS, where the controller adaptively changes the packet length for control based on the current status of the physical process. We formulate a decision-making problem and find the optimal variable-length packet-transmission policy for…
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Taxonomy
TopicsAge of Information Optimization · Advanced Wireless Network Optimization · Wireless Networks and Protocols
