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ThinkMind // SENSORCOMM 2012 , The Sixth International Conference on Sensor Technologies and Applications // View article sensorcomm_2012_9_30_10218


Non-Invasive Cognitive Radio for Firm Real-Time Sensor Applications in Heterogeneous Radio Environments

Authors:
Horst Hellbrück
Tim Esemann
Uwe Mackenroth
Marius Ciepluch
Arnaud Möschwitzer
Malte Ziethen

Keywords: Wireless Sensor; Cognitive Radio; Firm Real- time; Protocol

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.

Pages: 203 to 208

Copyright: Copyright (c) IARIA, 2012

Publication date: August 19, 2012

Published in: conference

ISSN: 2308-4405

ISBN: 978-1-61208-207-3

Location: Rome, Italy

Dates: from August 19, 2012 to August 24, 2012

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