Big Data/Machine Learning and D2D

Recently, big data, machine learning, and D2D communication have gained more attention to support the growth of data traffic and novel applications. The objective of this article is to present critical technology elements and show how new researches move forward to justify user requirements. In particular, D2D communication and vehicular networks can take advantage of the knowledge extracted using machine learning tools from collected data for better understanding and decision. Furthermore, emerging multi-agent reinforcement learning is highlighted to be a suitable tool with high potential. Finally, several research opportunities and challenges are addressed.