(2) it can allocate specific spectrum for IMT systems deploy- ments. The IMT-2020 is the ITU initiative to standardize and specify 5G technologies that are included in the IMT related recommendations. WRC-15 took a significant step toward 5G spectrum at low, medium, and high frequencies by identifying bands above 6 GHz for sharing studies prior to WRC-19. Some of the frequency bands identified in 2015 are already being utilized for the deployment of 4G networks in many regions of the world. As 5G standards and technologies continue to mature, bands already in use for 4G will be real- located to 5G systems as network operators migrate their networks from 4G to 5G. Availability of spectrum is crucial for testing and early deployments of 5G systems before 2020; therefore both higher and lower frequencies are presently needed to meet the require- ments of field trials of relevant 5G use cases that are being conducted by major network operators [29,30]. According to ITU-R vision, IMT-2020 systems are mobile systems which include the new capabilities of IMT systems that go beyond those of IMT-Advanced (see Fig. 16). The IMT-2020 systems support low to high-mobility applications and a wide range of data rates in accordance with user and service requirements in various deployment scenarios. IMT- 2020 systems also have capabilities for high-quality multimedia applications within a wide range of services and platforms, providing a significant improvement in performance and quality of service. A broad range of capabilities, tightly coupled with intended use cases and applications for IMT-2020 have been laid out in ITU-R vision in order to support emerging new usage scenarios and applications for 2020+ [1]. While the minimum technical requirements and corresponding evaluation criteria defined by ITU-R based on the envisioned capabilities for IMT-2020 systems could have been met by certain enhancements to the existing IMT systems, true fulfillment of the IMT-2020 sys- tem and service requirements necessitated development of g