Latency- And Resilience-aware Networking (LARN)
This project is part of the DFG (Deutsche Forschungsgemeinschaft) priority programme SPP 1914 “Cyber-Physical Networking”. It started in October 2016 and is carried out in cooperation with Department of Computer Science 4 at Friedrich-Alexander-Universität Erlangen-Nürnberg.
We propose to develop transport channels for cyber-physical networks. Such channels need to be latency- and resilience-aware; i.e. the latency as seen by the application must be predictable and in certain limits, e.g. by balancing latency and resilience, be guaranteed. This is only possible by an innovative transport protocol stack and an appropriate fundament of operating system and low level networking support. Thereto the project unites the disciplines Operating Systems / Real-Time Processing and Telecommunications / Information-Theory.
Project target is the evolution of the PRRT (predictably reliable real-time transport) transport protocol stack towards a highly efficient multi-hop-protocol with transparent transmission segmentation. This is enabled by an interdisciplinary co-development with a latency-aware operating system kernel incl. wait-free synchronisation and the corresponding low level networking components. The statistical properties of the entire system (RNA, “reliable networking atom”) shall be optimised and documented.
A software-defined networking testbed for validation of the system in a real-world wide area network scenario is available. The developed components are introduced during the workshops organised by the priority programme SPP1914 “Cyber-physical Networking” and is made available to other projects during the entire run-time of the priority programme.
- Develop a latency- and resilience-aware atomic unit for cyber-physical networks.
- Optimise the cross-layer communication while maintaining separability.
- Validate the approach in theory and experiments.
- Document the statistics of the predictable quality of communication (QoC).
Solutions & Results
- Predictably Reliable Real-time Transport (PRRT) Protocol
- Partially reliable, time-constrained process-to-process communication
- Adaptive Hybrid Error Control
- Latency-avoiding Congestion Control
- Rate Control & Pacing
- X-Lap: Cross-Layer Profiling and Latency AnalysisTool (Presentation – RTN2017)
- Transparent Transmission Segmentation (TTS) (Presentation – NetSoft2017)
- 4th Plenary Meeting, 30th November 2018, Tübingen
- KuVS Summer School “Industrial Internet”, 15th August 2018, Dinklage
- BarCamp “Hands-On Cyber-Physical Networking”
- 3rd Plenary Meeting, 23rd April 2018, Berlin
- 2nd Plenary Meeting, 19th October 2017, Aachen
- 1st Plenary Meeting, 21th October 2016, Munich
The publications can also be found on Google Scholar.
- Reif, Stefan; Raffeck, Phillip; Janker, Heiko; Gerhorst, Luis; Hönig, Timo; Schröder-Preikschat, Wolfgang: “Earl: Energy-Aware Reconfigurable Locks”, Proceedings of the 9th Embedded Operating Systems Workshop (EWiLi), New York City, New York, USA, October 2019
- Schmidt, Andreas; Reif, Stefan; Gil Pereira, Pablo; Hönig, Timo; Herfet, Thorsten; Schröder-Preikschat, Wolfgang: “Cross-layer Pacing for Predictably Low Latency”, 6th International IEEE Workshop on Ultra-Low Latency in Wireless Networks (ULLWN), Paris, France, April 2019
- Hönig, Timo; Herzog, Benedict; Schröder-Preikschat, Wolfgang: “Energy-Demand Estimation of Embedded Devices Using Deep Artificial Neural Networks”, 34th ACM/SIGAPP Symposium on Applied Computing (SAC), Limassol, Cyprus, April 2019
- Gallenmüller, Sebastian; Glebke, René; Günther, Stephan; Hauser, Eric; Leclaire, Maurice; Reif, Stefan; Rüth, Jan; Schmidt, Andreas; Carle, Georg; Herfet, Thorsten; Schröder-Preikschat, Wolfgang; Wehrle, Klaus: “Enabling Wireless Network Support for Gain Scheduled Control“. 2nd International Workshop on Edge Systems, Analytics and Networking (EdgeSys), Dresden, Germany, March 2019
- Reif, Stefan; Gerhorst, Luis; Bender, Kilian; Hönig, Timo: “Towards Low-Jitter and Energy-Efficient Data Processing in Cyber-Physical Information Systems”, 52nd Hawaii International Conference on System Sciences (HICCS), Maui, Hawaii, USA, January 2019
- Reif, Stefan; Schmidt, Andreas; Hönig, Timo; Herfet, Thorsten; Schröder-Preikschat, Wolfgang: “∆elta: Differential Energy-Efficiency, Latency, and Timing Analysis for Real-Time Networks“, 16th International Workshop on Real-Time Networks (ECRTS RTN), Barcelona, Spain, July 2018
- Gil Pereira, Pablo; Schmidt, Andreas; Herfet, Thorsten: “Cross-Layer Effects on Training Neural Algorithms for Video Streaming” (arxiv), 28th ACM SIGMM Workshop on Network and Operating Systems Support for Digital Audio and Video (NOSSDAV), Amsterdam, Netherlands, June 2018
- Reif, Stefan; Schröder-Preikschat, Wolfgang: “A Predictable Synchronisation Algorithm (Poster)”, 23rd Annual Symposium on Principles and Practice of Parallel Programming (PPoPP), Vienna, Austria, February 2018
- Schmidt, Andreas; Herfet, Thorsten: “NEAT: Network Experiment Automation Tool“, 1. KuVS Fachgespräch “Network Softwarization” (KuVS-FG-NetSoft), Tübingen, Germany, October 2017
- Schmidt, Andreas; Herfet, Thorsten: “Transparent Transmission Segmentation in Software-Defined Networks” (SciDok), IEEE Conference on Network Softwarization (NetSoft), Bologna, Italy, July 2017
- Reif, Stefan; Schmidt, Andreas; Hönig, Timo; Herfet, Thorsten; Schröder-Preikschat, Wolfgang: “X-Lap: A Systems Approach for Cross-Layer Profiling and Latency Analysis for Cyber-Physical Networks” (arxiv), 15th International Workshop on Real-Time Networks (ECRTS RTN), Dubrovnic, Croatia, June 2017
- Reif, Stefan; Hönig, Timo; Schröder-Preikschat, Wolfgang: “In the Heat of Conflict: On the Synchronisation of Critical Sections“, IEEE International Symposium on Real-Time Distributed Computing (ISORC), Toronto, Canada, May 2017
- Schmidt, Andreas; Herfet, Thorsten: “Approaches for Resilience- and Latency-Aware Networking“, International Symposium on Networked Cyber-Physical Systems (NetCPS, Poster Session), Munich, Germany, September 2016
Student Projects & Theses
- Kai Vogelgesang, “Fast Transparent Transmission Segmentation with Kernel-Bypass Networking”, Bachelor Thesis, April 2019
- Lukas Bard, “Network Protocol for Video Transport in Cyber-Physical Systems”, Master Thesis, November 2017
- Daniel Birtel, “Transparent Transmission Segmentation for Multimedia Applications”, Master Thesis, January 2017
- Philipp Tennigkeit, “NEAT – Network Experiment Automation Tool”, Project
- Marlene Böhmer, “Demonstration and Evaluation Platforms for Cyber-Physical Networking”, Project
- Ashkan Taslimi, “Hybrid Error Coding for Cyber-Physical Networking”, Project
People and Partners
BarCamp Aachen Contributors (EdgeSys2019 Paper)
- Sebastian Gallenmüller (Technical University of Munich)
- René Glebke, MSc. (RWTH Aachen University)
- Dr.-Ing. Stephan Günther (Technical University of Munich)
- Eric Hauser (Technical University of Munich)
- Maurice Leclaire, MSc. (Technical University of Munich)
- Jan Rüth, MSc. (RWTH Aachen University)
BarCamp “Hands-On Cyber-Physical Networking” Contributors
- Adwait Datar, MSc. (TUHH)
- Christine Kloock, MSc. (TUHH)
- Florian Rosenthal, MSc. (KIT)