HERDS (Harte Echtzeit Regelungen mit drahtlosen Sensoren)

Duration: 01.10.2010 - 31.12.2012
Project Leader: Prof. Dr.-Ing Horst Hellbrück
Staff: Joachim Kaczmareck, Tim Esemann, Malte Ziethen, Arnaud Möschwitzer, Marius Ciepluch,

New Ideas

HERDS Hardware
Hardware for Projekt HERDS
  • Analysis of a wireless Real-Time System.
  • Focus: Real-Time Capabilities in unknown Environment
  • Resarch in new Applications for wireless Sensornetworks with hard Real-Time Requirements


PenCon Image
  • Demonstration of efficient wireless Sensor Technology
  • New Applications in Automation
  • First Step towards cooperation of Radio Systems in Future.
  • Available as Demonstrator in Cooperation with


Refereed Conference Papers
[2012] Non-Invasive Cognitive Radio for Firm Real Time Sensor Applications in heterogeneous Radio Environments (Horst Hellbrück, Tim Esemann, Uwe Mackenroth, Marius Ciepluch, Arnaud Möschwitzer, Malte Ziethen), In Proceedings of the Sixth International Conference on Sensor Technologies and Applications (SENSORCOMM), 2012. [bib] [pdf] [abstract]
Some applications in Sensor Networks need firm real-time support in order to work properly. The difference to hard real-time systems is that this type of application can withstand minor violations of the maximum delay and minimum throughput if these violations are limited. Many standards like IEEE 802.15.4 provide standardized means to ensure delay and bandwidth constraints which work well when there are no interferers in the same frequency band. However, in a heterogeneous environment today these approaches fail when the interference is not aware of the IEEE 802.15.4 traffic. Switching the channel is one option to avoid this kind of interference. We suggest a new non-invasive cognitive radio protocol approach where all participants follow simple rules to enable firm real-time conditions in decentralized design. As a demonstrator we use a three-fold pendulum with firm real-time signal delay constraints of 5ms. The contributions of the paper comprise evaluation results by real measurements with the demonstrator system.
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