The lack of coordinated spectrum access for IoT wireless technologies in unlicensed bands creates inefficient spectrum usage and poses growing concerns in several IoT applications. Spectrum awareness becomes then crucial, especially in the presence of strict quality-of-service (QoS) requirements and mission-critical communication. In this work, we propose a lightweight spectral analysis framework designed for strongly resource-constrained devices, which are the norm in IoT deployments. The proposed solution enables model-based reconstruction of the spectrum of single radio-bursts entirely onboard without DFT processing. The spectrum sampling exploits pattern-based frequency sweeping, which enables the spectral analysis of short radio-bursts while minimizing the sampling error induced by non-ideal sensing hardware. We carry out an analysis of the properties of such sweeping patterns, derive useful theoretical error bounds, and explain how to design optimal patterns for radio front-ends with different characteristics. The experimental campaign shows that the proposed solution enables the estimation of central frequency, bandwidth, and spectral shape of signals at runtime by using a strongly hardware-limited radio platform. Finally, we test the potential of the proposed solution in combination with a proactive blacklisting scheme, allowing a substantial improvement in real-time QoS of a radio link under interference.
Industrial applications in the era of Industry 4.0 require more flexibility for the integration of new sensors and actuators and also demand high mobility for which wired communication is unsuitable. For the integration of wireless communication systems in an industrial application, guaranteed high Quality of Services (QoSs) is a premise that is not fully covered by wireless systems such as WiFi, Bluetooth, ZigBee or LTE. For the latter, the evolution to 5G systems as private or public networks is a currently ongoing process.This paper examines the legal and technical requirements to operate a private mobile cell in a smart factory and presents measurements on latency and bandwidth performance of current state of the art hardware as well as the integration in an industrial Layer 2 communication system. The system in use is ready for only low demanding industrial real-time applications but, nevertheless, the advantages of a licensed frequency range for private use become visible. Furthermore, some concepts defined by the 3GPP, e.g. mini-slots and grant free transmission, are pointed out that are expected to enhance the QoS guarantees for industrial traffic.
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