s on radio interface design. User experience associated with various use case categories could have spectrum implications in order to optimize overall performance. A methodical approach to categorization of future target applications was done in ITU-R, leading to the now-famous 5G usage scenario triangle as illustrated in Figure 2.9 (Section 2.5 ITU-R, M.2083). It is generally expected that 5G will require substantially higher spectrum ranges com- pared with 4G in addition to lower and middle ranges. Certain applications require highly robust performance over long distances, which is a characteristic of lower frequencies. Other applications need very high throughput over shorter distances, which is a charac- teristic of higher frequencies. These aspects could be optimally achieved through access to sufficient spectrum in a vari- ety of bands to deliver full 5G service. 1. Lower frequency ranges, e.g. below 1 GHz, for wider reachability; examples include macro cells, robust obstacle penetration, sensor networks, and automotive. 2.3 Spectrum 2. Middle frequency ranges, e.g. below 6 GHz, for coverage/capacity trade-off; examples include small cells and capacity boost. 3. Higher frequency ranges, e.g. mmWave, for higher throughput; examples include hot spots, Ultra High Definition (UHD) video streaming, Virtual Reality (VR), and Aug- mented Reality (AR). The wireless industry, therefore, has been encouraging regulators around the globe to designate sufficient amounts of spectrum in low, mid, and high ranges for 5G. The World Radiocommunication Conference (WRC-19) was particularly important, with mm Wave frequencies between 24.25 and 86 GHz being on its agenda. After several weeks of deliberations and intense negotiations, Administration members of ITU-R agreed on iden- tification of more than 17 GHz of new spectrum for IMT. These bands are listed below3: 24.25-27.5 GHz - global identification 37-43.5 GHz - global identification 45.5-47 GHz - regional/country-specific identification 47.2-48.2 GHz - regional/country-sp