"Millimetre wave (or mmWave) is spectrum that sits between microwave and infrared wavelengths in the region of frequencies between 24GHz and 300GHz and has not yet been made available to the UK MNOs for 5G. However, spectrum at the lower end of this range is planned for use in dense 5G small cell networks in urban hotspots where additional capacity is vital. The benefit of such high frequency spectrum is that it can carry incredibly high data transfer rates over short distances, so city scenarios and private 5G network deployments on sites such as airports are eagerly anticipating the release of this spectrum."