Question: why 28 ghz for 5g?
Answer: WRC-19 Agenda Item 1.13 The 26 GHz, 28 GHz and 40 GHz bands have emerged as the most likely candidates to enable the ultra-high-speed vision for 5G. The 26 and 28 GHz bands have the benefit of being adjacent, supporting economies of scale and facilitating early equipment availability for all or parts of both bands.