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diff --git a/text/zaver.tex b/text/zaver.tex index 5316a0e..788040f 100644 --- a/text/zaver.tex +++ b/text/zaver.tex @@ -1,16 +1,18 @@ \chapter*{Conclusion} +\addcontentsline{toc}{chapter}{Conclusion} -This semestral thesis provided a brief introduction to 4G/5G mobile networks for the Internet of Things (IoT) applications in the embedded electronic systems. Related communication protocols for 4G IoT networks (LPWAN NB-IoT and LTE-M) and 5G IoT networks (5G NR - URLLC) were described and a survey of two selected chipsets for 4G networks (Nordic Semiconductor nRF9160) and 5G networks (Quectel RM520N) and their development modules and kits was made. +This thesis described the principles of 4G and 5G mobile networks focusing architecture, communication protocols, and specific features relevant to IoT use cases. +It further analyzed \ac{LPWAN} protocols NB-IoT, LTE-M and noncellular 5G protocol DECT NR+. -%One of the development kits (nRF9160 DK) was then used for practical demonstration of an IoT device with LPWAN connectivity on an example of a combined burglary and fire alarm system with 4 sensors, transferring data to a remote cloud server via MQTT protocol. This demo allowed to establish a firmware development base for 4G IoT devices based on nRF9160 System-in-Package and get familiarized with the software development kit by Nordic Semiconductor with Zephyr RTOS support. -% -%Since there seem to be issues with a delivery of the appropriate 5G development kit by Quectel, being ordered for several months already, it would be advisable to focus the follow-up bachelor thesis only to 4G communication kits with nRF9160 System-in-Package and to further explore extensive firmware possibilities of this system for reliable and secure industrial IoT communication, specifically: -% -%\begin{itemize} -% \item Firmware upgrades via FOTA (firmware over the air) -% \item Implementation of ARM TrustZone technology for firmware protection against unauthorized changes -% \item ARM CryptoCell solution for high-performance cryptography -%\end{itemize} -% -%Experimental parameters of IoT communication (power consumption, lattency, reliability, effective range in complicated urban environment) shall also be verified, comparatively for NB-IoT and LTE-M protocols. +After providing an overview of the Nordic Semiconductor nRF9160, nRF9161 and nRF9151 chipsets with a review of commercially available development modules. + +Based on this research, the Connexio Pro development kit was selected for its usage of new chipset, very small form-factor and integrated features suitable for rapid prototyping of IoT devices. + +To demonstrate practical usage, a universal low-cost tracking application was developed using the selected kit. This kit demonstrated function of rapid prototype of tracker of smart sensor. + +Laboratory experimental measurements were done on nRF9160 and nRF961 using all supported protocol (NB-IoT, LTE-M, DECT NR+), focusing on key communication parameters such as power consumption measured by Nordic Power Profiler II, signal strength measured by the LTE modem itself, and data throughput calculated from combination of these. The collected data were arranged, extensively visualized and compared with theoretical expectations and to the LoRa technology. + +The mentioned demonstrator was than used in field experimental measurements were carried out using car on highway to verify ability of suggested scenarios to communicate in mobile setting. + +Important parts of findings throughout this theses were summarized in discussion chapter with comparison of mentioned protocols and outline of IoT scenarios with suggested appropriate protocols. |