A brief survey on 6G communications

The last decade has witnessed an excessive demand for mobile traffic. Though, fifth generation (5G) networks are in the initial phase of deployment and have wide capabilities and noble features to meet the data thrust up to some extent, it's time to think beyond 5G systems. It is being expected that next generation wireless system (6G) will entirely be automated and intelligent, and will be ubiquitous and ultra-high reliable towards connectivity to large number of devices. This paper aims towards discussing stringent requirements while focusing on key expected technologies that may shape the 6G networks. Various applications of 6G communications are then briefly outlined. At the end, paper also discusses the potential challenges for achieving the goal. These discussions will definitely open up the horizon for future research directions.