3.9G
It might be that Docomo is looking at ways to ramp up demand for its new 4G system. It wants to make a smooth transition from 3G to 4G, so it'll start with its so-called 3.9G system that can use existing infrastructure. With 3.9G, you download data on a mobile at fiber-optic speed. I think Docomo is looking for ways to use that capability as well as expand its market outside of Japan.