Through my research I found this nice story to illustrate the three main use cases for 5G as below :
To understand the three broad use cases that 5G wireless technology seeks to transform,consider a typical morning office commute in a 5G-connected car just a few years down the road.The vehicle is constantly exchanging position, behavior, and system status information with nearby vehicles, the surrounding highway infrastructure, and traffic control centers.
Doing so in a fast and reliable manner augments the car’s awareness of its surroundings and allows the driver
to turn the steering, accelerating, and braking functions over to the car’s semi-autonomous driving
system. He can now focus on the morning’s first conference call.
The driver’s team is trying to find the root cause of a turbine malfunction. He puts on his augmented reality (AR) set, and a wireless 4K video feed of an airplane turbine overlaid with sensor data and gauge readings fills his screen. Collaborating in real time with a group of engineers in three different countries, the team guides a technician to isolate one of the components and recommends a troubleshooting procedure.
A few minutes later, when his intelligent-highway exit comes up, the driver takes back control of the car, switches over to a low-bandwidth voice-only connection, and drives into work. The car guides him to the closest available parking spot with an electric charging station.
The parking sensor at that spot detects his car and updates the parking availability information on the network. When he plugs in the car to charge, the charging terminal establishes a lowdata-rate connection to verify his account and process payment.
Source : National Instruments