Análisis teórico y experimental de las prestaciones de la tecnología NB-IoT.
Document typeBachelor thesis
Rights accessOpen Access
This project aims at analyzing the NB-IoT technology both in a theoretical and practical manner. Its performance has been assessed from three different and complementary viewpoints: theoretical analysis, creation of a simulator with the correspondingsimulationsandmeasurements with a NB-IoT device in a real network deployment.The theoretical calculations have beenperformed under different NB-IoT configurations, with different levels of data protection / redundancy. The worst case allows very deep coverage conditions but it does negatively impact on transmission times. For short data packets throughput levelsare acceptable. On the other hand, large packetsof 1 Mbyteshow unacceptable transmission times ofmore than 12 days for the worst casescenario.A simulator of NB-IoT has been designed to compare the simulations with the theoretical cases and to allow the user to simulate any downlink or uplink scenario configuring all the possible parameters allowed by NB-IoT. Results revealthat the initial pointof the downlink transmissionin the system frameaffect the total transmission time, which means that average theoretical calculations may show an approximation error. In the uplink, resource allocation algorithms should smartly consider NPRACH opportunities occupation to minimize transmission delays, which can be very large for certain configurations.Finally, using Vodafone’s NB-IoT network, some uplink data transmissions have been performed and analyzed with different data packet length for anintermediate coverageand a bad coverage case.The results have revealeda high variability in the transmission times and the way of transmitting the packet even with similar coverage levels.The real scenario has been reproduced in the simulator and the results have beencompared with the real measurements.