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| Päätekijät: | , , , , |
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| Aineistotyyppi: | Preprint |
| Julkaistu: |
2020
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| Aiheet: | |
| Linkit: | https://arxiv.org/abs/2005.13321 |
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| _version_ | 1866913566335959040 |
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| author | Huang, Kang Liu, Wanchun Li, Yonghui Savkin, Andrey Vucetic, Branka |
| author_facet | Huang, Kang Liu, Wanchun Li, Yonghui Savkin, Andrey Vucetic, Branka |
| contents | 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 minimizing the long-term average cost of the WNCSs. We derive a necessary and sufficient condition on the existence of the optimal policy in terms of the transmission reliabilities with different packet lengths and the control system parameter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2005_13321 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Wireless Feedback Control with Variable Packet Length for Industrial IoT Huang, Kang Liu, Wanchun Li, Yonghui Savkin, Andrey Vucetic, Branka Information Theory Systems and Control 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 minimizing the long-term average cost of the WNCSs. We derive a necessary and sufficient condition on the existence of the optimal policy in terms of the transmission reliabilities with different packet lengths and the control system parameter. |
| title | Wireless Feedback Control with Variable Packet Length for Industrial IoT |
| topic | Information Theory Systems and Control |
| url | https://arxiv.org/abs/2005.13321 |