Femtocells are remotely controlled by the carrier, they require GPS location (and maybe spectrum sensing), and I assume the backhaul is over VPN. Obviously they can't guarantee any QoS but it's better than having no signal.
(Fun trivia: Our office paid $XX,000 for AT&T MicroCells which wouldn't activate because they couldn't get GPS signal.)
(Fun trivia: Our office paid $XX,000 for AT&T MicroCells which wouldn't activate because they couldn't get GPS signal.)