Cellular Internet of Things (CIoT) has emerged as a promising technology to support applications that generate infrequent data. One requirement on these applications, often battery-powered devices, is low energy consumption to enable extended battery life. Narrowband IoT (NB-IoT) is a promising technology for IoT due to its low power consumption, which is essential for devices that need to run on battery power for extended periods. However, the current battery life of NB-IoT devices is only a few years, which is insufficient for many applications. This thesis investigates the impact of energy-saving mechanisms standardized by 3GPP on battery life of NB-IoT devices. The main research objective is to classify and analyze existing energy-saving solutions for CIoT and examine their limitations, to study the impact of standardized energy-saving mechanisms on the battery life of NB-IoT devices, both in isolation and combined, and to provide guidelines on how to configure NB-IoT devices to reduce energy consumption efficiently. The research aims to provide a deeper understanding of the effect of energy-saving mechanisms and best practices to balance energy efficiency and performance of NB-IoT devices. Applying the proposed solutions makes it possible to achieve a battery life of 10~years or more for CIoT devices.

Cette thèse propose une analyse croisée des coopérations inter-organisationnelles territorialisées (CIOT) et du capital social, entendu comme l'ensemble de ressources accessibles aux organisations généré par leurs relations professionnelles. Pour cela, nous développons une méthode rapprochant une caractérisation des réseaux sociaux professionnels par classification des acteurs et relations, avec les formes de coopérations révélées par une analyse qualitative. Cette méthode est appliquée au thermalisme dans les Landes, secteur captif d'une ressource locale, l'eau minérale naturelle, et caractérisé par la proximité de nombreux acteurs publics et privés qui s'interrogent sur leurs coopérations en vue de s'adapter aux mutations de leur environnement. Nos résultats mettent à jour les liens entre le capital social collectif détenu par l'ensemble des organisations publiques et privées du thermalisme dans Les Landes et deux types de CIOT. D'une part, notre analyse indique qu'un capital social collectif faible entrave la gouvernance territoriale mixte (publique-privée). D'autre part, nos résultats suggèrent que les difficultés de la coopétition entre acteurs privés concurrents proches géographiquement ne s'expliquent pas uniquement par leur capital social collectif, mais par d'autres facteurs, en particulier humains. / This thesis provides a cross analysis of local inter-organizational cooperations (LIOC) and social capital, understood as accessible resources through professional relationships. For this purpose, we develop an analysis method that reconciles the characterization of professional social networks by the classification of actors and relations, with forms of cooperation revealed by a qualitative analysis.This method is applied to thermalism in Les Landes. This sector is strongly entrenched in the local mineral water resource and is characterized by the proximity of numerous public and private actors who question their cooperations in order to adapt to their evolving environment.The results indicate links between social capital owned by all private and public actors of thermalism in Les Landes and two kinds of LIOC. First, our analysis show that weak collective social capital hinders mixed (public-private) local governance. Second, our results suggest that difficulties of coopetition between geographically close private competitors may not only due to collective social capital, but they could be explained by other factors, particularly human factors.