Channel Access Strategies for Control-Communication Co-Designed Networks
Gourab Ghatak (Indian Institute of Technology Delhi)
Geethu Joseph (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Chen Quan (TU Delft - Electrical Engineering, Mathematics and Computer Science)
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Abstract
In this article, we develop a communication-control co-design framework in a wireless networked control system with multiple geographically separated controllers and controlled systems, modeled via a Poisson point process. Each controlled system consists of an actuator, plant, and sensor. Controllers receive state estimates from sensors and design control inputs, which are sent to actuators over a shared wireless channel, causing interference. Our co-design includes control strategies at the controller based on sensor measurements and transmission acknowledgments from the actuators for both rested and restless systems - systems with and without state feedback, respectively. In the restless system, controllability depends on consecutive successful transmissions, while in the rested system, it depends on total successful transmissions. We use both classical and block ALOHA protocols for channel access, optimizing access based on sensor data and acknowledgments. A statistical analysis of control performance is followed by a Thompson sampling-based algorithm to optimize the ALOHA parameter, achieving sublinear regret. We show how the ALOHA parameter influences control performance and transmission success.