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NB-IoT Devices in Reverberation Chambers: A Comprehensive Uncertainty Analysis
Anouk Hubrechsen1, Kate A Remley2, Robert D Jones2
1Department of Electrical Engineering, Eindhoven University of Technology, 5612 AZ Eindhoven, The Netherlands.
International Journal of Microwave and Wireless Technologies
|July 16, 2021
Summary
New internet-of-things (IoT) protocols like NB-IoT and CAT-M1 introduce significant measurement uncertainties in reverberation chambers. Current methods may overestimate uncertainty, potentially leading to non-compliance with standards.
Area of Science:
- Electromagnetic compatibility (EMC) testing
- Wireless communication protocols
- Metrology and measurement uncertainty
Background:
- Narrowband Internet-of-Things (IoT) protocols (e.g., NB-IoT, CAT-M1) present unique challenges for reverberation chamber (RC) measurements.
- These protocols' characteristics can lead to unaddressed measurement effects and increased channel variations, impacting uncertainty quantification.
Purpose of the Study:
- To conduct a comprehensive uncertainty analysis for NB-IoT and CAT-M1 device measurements in RCs.
- To identify and quantify dominant uncertainty components specific to these narrowband protocols.
- To evaluate the impact of these uncertainties on compliance with existing standards.
Main Methods:
- Extended a previous study on NB-IoT and CAT-M1 uncertainty in RCs.
- Performed a detailed uncertainty analysis of reference and Device Under Test (DUT) measurement components.
- Utilized significance testing to identify dominant uncertainty sources.
Main Results:
- Certain uncertainty components are shown to be dominant for narrowband IoT protocols and cannot be neglected.
- Standardized test methods may underestimate or misattribute uncertainty for these technologies.
- Failure to account for these specific uncertainties can lead to significant overestimation and potential non-compliance.
Conclusions:
- A refined uncertainty analysis is crucial for accurate NB-IoT and CAT-M1 measurements in reverberation chambers.
- Current standardized testing procedures may require updates to accommodate narrowband IoT characteristics.
- Accurate uncertainty quantification is essential for ensuring reliable device compliance.
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