LTE's frequent gotcha has been indoor coverage: as it often relies on high frequency ranges outside of the US, the signal can drop off quickly at home or in the mall. There have been LTE femtocells before to fill in the gaps, but NTT DoCoMo claims to have the first mini cell site that would cover our needs much more thoroughly. The Japanese carrier's new base station run simultaneous 112.Mbps LTE and 14.4Mbps HSDPA (sorry, no HSUPA upload speeds) on the 2GHz band to keep 3G data and voice working side-by-side with 4G, piping both through a wired broadband connection; there's no need to sacrifice the basics or legacy support just for a better LTE signal. NTT DoCoMo plans to sell the dual-mode femtocell to local homeowners, offices and stores in December. Sadly, there's no immediate word of plans for femtocells that support networks abroad, although the technology's existence gives us hope that we'll see it spread to other providers -- and that black holes in cellular coverage will be distant memories.