Very small autonomous robots could cooperate to solve an almost infinite number of problems. Prototypes of such robots do already exist at the micro scale and even smaller ones are expected. Yet allowing them to wirelessly communicate considerably enhance their possible usages. In this paper, we revisit Vouivre, a nano-wireless simulation library we previously developed. Micro or nano-robots will be possibly be numerous and we needed to integrate new ideas to enhance the scalability of Vouivre. Using the specificities of the Terahertz radio channel as a foundation, we discuss and present an implementation that allows simulation of a larger number of concurrent transmissions between an even larger number of individual elements.