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In wireless communications, relay selection is very important to enhance the communications between the resource and destination. However, only transmission coefficients are considered in traditional relay selection. In this paper, we consider the relay selection in wireless packetized predictive control (PPC) systems, where our goal is to select the relay nodes by jointly considering communication sub-system and control sub-system. To achieve this goal, we propose a buffer-aided relay selection method, in which both communication performance and control performance are jointly optimized. Simulation results show the performance of our proposed method.

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Packetized predictive control (PPC) is an effective solution to ensure the robustness of the control system over unreliable wireless links. However, conventional wireless transmission methods in PPC suffer from either high wireless resource consumption or poor performance of real-time control due to the separately design of the two parts. To deal with the issue, we propose a communicationcontrol co-design approach to achieve good trade-off between real-time control performance and communication energy efficiency. Our results demonstrate the advantages of the communication-control co-design.