5G Spectrum: Challenges and Perspectives

5G will start dynamic exploration of radio spectrum above 6 GHz. Ranges of centimetric waves (3 GHz - 30 GHz) and millimetric waves (30 GHz - 300 GHz) will allow the allocation of much wider channel bandwidths per single user than in any previous mobile system, but at the same time introduce more challenging radio propagation conditions. According to the regulation and pre-standardization agreements, study on 5G has been restricted to particular frequency bands. However, extensive investigations on spectrum sharing techniques raise expectations that in the near future 5G will be able to share radio frequency bands with other systems, what may influence future decisions of regulatory bodies in regards to bands globally allocated for 5G.