mmWave is high band spectrum which is lies greater than 24 GHz.
Initially, we are observing 5G deployments based on low band which is sub 1 GHz and mid band which is sub 6 GHz. 5G connected devices will be increasing rapidly.
6 use cases for mmWave 5G deployment
1. Transportation hubs (e.g., train and bus stations)
2. Offices
3. Outdoor dense hot zones (e.g., high street shopping centers)
4. Indoor shopping malls
5. Stadiums
6. Fixed wireless access
for details information visit https://5gnetworkarchitecture.com/6-use-cases-for-mmwave-5g-deployment/