The main objectives of my research are the identification, the conception and the selection of the most appropriate network architectures for communication services. Such services require functionality specifications, decisions about where and how they must be deployed in a system, and the dimensioning of their different components. These objectives lead to two types of complementary research fields: the systems’ qualitative aspects and the quantitative aspects which are essential to the correct dimensioning of these architectures and the associated services (performance, Quality of Service (QoS), and Quality of Experience (QoE)).