The dynamics of the mmWave channel imply that the directional path to any cell can deteriorate rapidly, necessitating the need for intensive tracking of the mobile terminal.
While spectrum at mmWave frequencies is less scarce than at traditional frequencies below 6 GHz, still it is not unlimited. Therefore, an efficient use of the spectrum is critical to harvest the maximum benefit.
example test 2
In mmWave 5G systems, a mechanism by which the BS and the UE determine suitable initial directions of transmission must be determined.