The document provides an overview of 5G (fifth generation mobile networks) including its objectives, requirements, proposed architectures, and technologies. It discusses how 5G aims to greatly increase network capacity and spectral efficiency to support the growth in mobile data traffic. Key 5G technologies proposed include small cells, massive MIMO, virtual radio access networks, and software-defined networking. Several countries and groups are working on 5G projects with commercialization targeted around 2020.