1) 5G standardization is accelerating with the first 5G trials for the 2018 Winter Olympics and commercial 5G networks expected between 2018-2022. 2) Building dense 5G networks will require significant investment in new cell sites, and it is unclear if mobile network operators can invest alone given high costs of $150-300 per subscriber. 3) Global 5G research and development spending in 2016 is estimated at $56 billion if 5G represented 2% of global research spending, with mobile operators and infrastructure vendors accounting for most investment.