Nowadays, we are more and more surrounded by powerful and intelligent communicating objects. Many of these objects, as smart- phones, watches, detectors and soon cars, are moving in increasingly interconnected environments, have abilities to communicate with each other and to exchange information. A collaborative approach allows these entities to exchange information and objectives and to implement rules in a structured manner in order to optimize the execution of their own mission and, therefore, the operation of the system in general. For example, collaborative behaviours and informations exchanges could improve the movement of vehicles in an urban center and avoid traffic jams. Our contribution puts a stress on a definition of collaboration in the context of mobile communicating entities. For the sake of agent-based modeling, we also list challenges raised like technical architecture and data organisation. Then we propose an hybrid architecture for collaborative exchanges with an example based on communicating vehicles in an urban context and implemented on the GAMA platform.