One of the main differences between 4G and 5G is the level of latency, of which 5G will have much less. 5G will use orthogonal frequency-division multiplexing (OFDM) encoding, similar to 4G LTE. 4G, however, will use 20 MHz channels, bonded together at 160 MHz. 5G will be up to between 100 and 800 MHz channels, which requires larger blocks of airwaves than 4G.
Samsung is currently researching 6G. Not too much is currently known on how fast 6G would be and how it would operate; however, 6G will probably operate in similar differences in magnitude as between 4G and 5G. Some think 6G may use MM waves on the radio spectrum and may be a decade away.
5G use cases can range from business and enterprise use to more casual consumer use. Some examples of how 5G can be used include the following:
streaming high-quality video;
communication among devices in an internet of things (IoT) environment;
more accurate location tracking;
fixed wireless services;
low-latency communication; and
better ability for real-time analytics.
More info: noc engineer