Narrowband (NB) radio signals are widely used in the context of low power, wide area (LPWA) networks, which are one of the key components of the Internet-of-Things (NB-IoT). However, because of their limited bandwidth, such signals are not well suited for accurate localization, especially when used in a complex environment like high buildings areas or urban canyons, which create signals reflections and obstructions. One approach to overcome these difficulties is to use a 3D model of the city and its buildings in order to better predict the signal propagation. Because this modelling is very complex, state-of-the art localization algorithms cannot handle it efficiently and new techniques based on machine learning and artificial intelligence should be considered to solve this very hard problem. The LCOI laboratory has deployed a NB-IoT network in the city of Grenoble and is currently building a very large database to support these studies. Based on an analysis of the existing literature and using the knowledge acquired in the LCOI laboratory, the researcher will - Contribute and supervise the current data collection. - Exploit existing database to perform statistical analysis and modelling of NB-IoT signal propagation in various environments. - Develop a toolchain to simulate signal propagation using 3D topology. - Refine existing performance bounds through a more accurate signal modelling. - Develop and implement real-time as well as off line AI-based localization algorithms using 3D topology. - Evaluate and compare developed algorithms with respect to SoTA algorithms. - Contribute to collaborative or industrial projects through this research work. - Publish research papers in high quality journals and conference proceedings.