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Offloading Safety- and Mission-Critical Tasks via Unreliable Connections

Authors Lea Schönberger , Georg von der Brüggen , Kuan-Hsun Chen , Benjamin Sliwa , Hazem Youssef , Aswin Karthik Ramachandran Venkatapathy , Christian Wietfeld , Michael ten Hompel , Jian-Jia Chen

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Author Details

Lea Schönberger
  • Design Automation for Embedded Systems Group, Faculty of Computer Science, TU Dortmund University, Germany
Georg von der Brüggen
  • Design Automation for Embedded Systems Group, Faculty of Computer Science, TU Dortmund University, Germany
Kuan-Hsun Chen
  • Design Automation for Embedded Systems Group, Faculty of Computer Science, TU Dortmund University, Germany
Benjamin Sliwa
  • Communication Networks Institute, Faculty of Electrical Engineering, TU Dortmund University, Germany
Hazem Youssef
  • Chair of Material Handling and Warehousing, Faculty of Mechanical Engineering, TU Dortmund University, Germany
Aswin Karthik Ramachandran Venkatapathy
  • Chair of Material Handling and Warehousing, Faculty of Mechanical Engineering, TU Dortmund University, Germany
Christian Wietfeld
  • Communication Networks Institute, Faculty of Electrical Engineering, TU Dortmund University, Germany
Michael ten Hompel
  • Chair of Material Handling and Warehousing, Faculty of Mechanical Engineering, TU Dortmund University, Germany
Jian-Jia Chen
  • Design Automation for Embedded Systems Group, Faculty of Computer Science, TU Dortmund University, Germany

Funding

This work is supported by Deutsche Forschungsgemeinschaft (DFG) within the Collaborative Research Center SFB 876, projects A1, A3, A4, and B4.

Acknowledgements

The authors thank Jui-Lin Liang for his support and Niklas Ueter for his valuable feedback.

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Lea Schönberger, Georg von der Brüggen, Kuan-Hsun Chen, Benjamin Sliwa, Hazem Youssef, Aswin Karthik Ramachandran Venkatapathy, Christian Wietfeld, Michael ten Hompel, and Jian-Jia Chen. Offloading Safety- and Mission-Critical Tasks via Unreliable Connections. In 32nd Euromicro Conference on Real-Time Systems (ECRTS 2020). Leibniz International Proceedings in Informatics (LIPIcs), Volume 165, pp. 18:1-18:22, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2020) https://doi.org/10.4230/LIPIcs.ECRTS.2020.18

Abstract

For many cyber-physical systems, e.g., IoT systems and autonomous vehicles, offloading workload to auxiliary processing units has become crucial. However, since this approach highly depends on network connectivity and responsiveness, typically only non-critical tasks are offloaded, which have less strict timing requirements than critical tasks. In this work, we provide two protocols allowing to offload critical and non-critical tasks likewise, while providing different service levels for non-critical tasks in the event of an unsuccessful offloading operation, depending on the respective system requirements. We analyze the worst-case timing behavior of the local cyber-physical system and, based on these analyses, we provide a sufficient schedulability test for each of the proposed protocols. In the course of comprehensive experiments, we show that our protocols have reasonable acceptance ratios under the provided schedulability tests. Moreover, we demonstrate that the system behavior under our proposed protocols is strongly dependent on probability of unsuccessful offloading operations, the percentage of critical tasks in the system, and the amount of offloaded workload.

Subject Classification

ACM Subject Classification
  • Computer systems organization → Real-time systems
Keywords
  • internet of things
  • cyber-physical systems
  • real-time
  • mixed-criticality
  • self-suspension
  • computation offloading
  • scheduling
  • communication

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