Cao, J., Zhu, X., Sun, S., Popovskiz, P., Feng, S., Jiang, Y. (2022). Age of Loop Oriented Wireless Networked Control System: Communication and Control Co-Design in the FBL Regime. IEEE INFOCOM 2022 - IEEE Conference on Computer Communications Workshops (INFOCOM WKSHPS). https://doi.org/10.1109/infocomwkshps54753.2022.9798216
Abstract:
In this paper, age of loop (AoL) is investigated for communication and control co-design in wireless networked control systems (WNCSs), to ensure information freshness in the sensor-controller-actuator loop with two-way delay. Also, the impact of fading channel and finite block length due to limited transmission bits are considered. A closed-form expression for Peak AoL (PAoL) is derived with respect to block length and the number of allowable transmissions in the presence of block error probability. It is shown that the average PAoL is less than the sum of the average peak Age of information (PAoI) in uplink (PAoU) and the PAoI in downlink (PAoD), due to the coupling of uplink and downlink. In addition, the average PAoL is proved to be convex with respect to block length and mono-decreasing with respect to the allowable transmission time. We then propose a low-complexity PAoL-aware block length adaptation scheme with retransmission policy and optimal control. Simulation results verify the correctness of our analytical results and demonstrate the effectiveness of the proposed PAoLaware block length adaptation scheme in terms of information freshness and control performance.
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Funding Info:
This paper was supported in part by National Natural Science Foundation of China under Grants 62171161 and 61901138, in part by the Natural Science Foundation of Guangdong Province under Grant 2021A1515011832, in part by Shenzhen Science and Technology Program under Grants JCYJ20210324133009027, JCYJ20210324131010028 and KQTD20190929172545139.