The success of space technology evolves according to the technological progression in terms of density of CMOS integration (Complementary on - Silicon Metal) and MEMS (Micro-Electro-Mechanical System) . The need of spatial services has been a significant growth due to several factors such as population increases, telecommunication applications, climate changes, earth control and observation military goals, and so on. To cover this, spatial vehicle generations, specific calculators and Femto-cell systems have been developed. More recently, Ultra - Small Satellites (USS) have been proposed and different approaches, concerning developing of these kind of spatial systems, have been presented in literature. This miniature satellite is capable to fly in the space and to provide different services such as imagery, measures and communications [4, 9, 10]. This paper deals with the study of two different USS Femto-satellite architectures that exist in literature in order to propose a future architecture that can provide an optimization of power supply consumption and ameliorate service communication quality.