All roads seem to be leading to Dynamic Spectrum Sharing (DSS) for efficient use of airwaves for all forms of wireless communication, including WiFi, 4G, and 5G. This seems like a turnaround for the US, where DSS was almost cast into the dustbin of history as a sunset technology. Since DSS had been temporally embraced by operators for coexistence between 4G and 5G over shared frequencies but was then relegated in importance when operators acquired fresh dedicated mid-bands for 5G. Yet this was a false twilight, for DSS has application across all bands and is actually gaining traction for 4G and 5G coexistence among many operators around the world, given that the former will hang around for a decade or…