Distributed Channel Access for Control Over Unknown Memoryless Communication Channels

• 成果类型: Article
• 署名作者: Farjam, Tahmoores; Wymeersch, Henk; Charalambous, Themistoklis
• 署名单位: Aalto University; Chalmers University of Technology
• 刊物名称: IEEE TRANSACTIONS ON AUTOMATIC CONTROL
• ISSN/ISSBN: 0018-9286
• DOI: 10.1109/TAC.2021.3129737
• 发表日期: 2022
• 页码: 6445-6459
• 关键词: bandits; distributed deterministic channel access; exploration-exploitation; stability analysis; wireless networked control systems (WNCSs)

摘要

We consider the distributed channel access problem for a system consisting of multiple control subsystems that close their loop over a shared wireless network. We propose a distributed method for providing deterministic channel access without requiring explicit information exchange between the subsystems. This is achieved by utilizing timers for prioritizing channel access with respect to a local cost which we derive by transforming the control objective cost to a form that allows its local computation. This property is then exploited for developing our distributed deterministic channel access scheme. A framework to verify the stability of the system under the resulting scheme is then proposed. Next, we consider a practical scenario in which the channel statistics are unknown. We propose learning algorithms for learning the parameters of imperfect communication links for estimating the channel quality and, hence, define the local cost as a function of this estimation and control performance. We establish that our learning approach results in collision-free channel access. The behavior of the overall system is exemplified via a proof-of-concept illustrative example, and the efficacy of this mechanism is evaluated for large-scale networks via simulations.