The SCN envisaged in ECOSCells provide a transparent plug-and-play infrastructure, which can be deployed in an instantaneous manner and which can evolve on its own (energy and configuration-wise), without any human intervention. However, the theoretical foundation of small cells networks faces much broader constraints:

• The system changes rapidly and the small cells network needs to adapt fast and even anticipate future evolutions.

• As density of base stations increases, interference becomes bottleneck. Classical techniques for frequency and space reuse or power control are not able to resolve themselves the complexity of the system.

The co-existence of different systems may lead to conflicted communications, then decisions have to be made based on such distributed information.