What is 6G (6th Generation)?

It is the 6th generation of wireless communications networks. 6G Systems are required to design in order to meet the demands for a fully connected and intelligent digital world. 6G technology envisions Novel disruptive communication technologies, Innovative network architectures, Integrating Intelligence in the cloud. 6G technology is expected to have New spectrum, disruptive technologies, cell-less networks, disaggregation and virtualization, energy efficiency and Artificial intelligence. 6G can support many applications like VR (Virtual reality) and AR (Augmented Reality) ,Holographic telepresence, eHealth, Pervasive connectivity, Industry 4.0 and robotics, unmanned mobility etc.

6G enabling technologies include Disruptive communication technologies : 6G networks are expected to rely on conventional spectrum (sub 6 Ghz and mmwave) which will bring the potential of high frequency and also it should focus on frequency bands which are not used till now for cellular networks like THz (Terahertz bands ) and VLC (Visible light communications) . THz communications and VLC are two novel techniques which are used for 6G technology. THz communications operate between 100 GHz and 10 THz and compared to mmwaves which will bring data rates upto hundreds of gbps which is the main requirement of 6G. VLC has been proposed to complement RF communications with the wide adoptions of LEDs.

Additional research is required to enable 6G mobile users to operate in the THz and VLC spectra including hardware requirements and various algorithms in the NLOS (Non Line of Sight) environment. Besides the new spectrum, 6G will also transform wireless networks by using a new set of technologies which will be the key enabler of 6G technology. These technologies include : full duplex communication stack, Novel channel estimation techniques (e.g out of band estimation and compressed sensing) , sensing and network based localization, innovative network architectures, tight integration of multiple frequencies and communication technologies and cell less architecture, 3D network architecture, disaggregation and virtualization of networking of the networking equipment, Advanced access - backhaul integration, energy harvesting strategies for low power consumption network operations. 6G technology can integrate intelligence in the network like learning techniques for data selection and feature extraction , inter-user inter-operator knowledge sharing, user-centric network architecture.

6G technology requires new IP Architecture because 6G services would require very large volumes of data e.g for holograms and holographic type communications, and time precision services in terms of latency and packet loss such as machine to machine communications and industrial control. For 6G services, the fundamentals of the IP layer need to be entirely redesigned. Many Nets are also emerging e.g satellite networks and Industrial IoT networks.

6G wireless research can disrupt the traditional cellular networking paradigms that still exist in the 5G technology by introducing the support for THz communications and visible light communications , it has proposals of cell less architectures and aerial architectures and use of massive distributed intelligence. It will be fully available for society in around 2030 and beyond.