Small cells explained:
Metrocells, Femtocells, Cell Spots & Network Extenders
"Small Cells" are a class of devices that act as mini cell towers. Different carriers have different names for these devices: AT&T calls them Metrocells, Verizon calls them Enterprise LTE Network Extenders, while T-Mobile calls them Cellspots.
No matter what they're called, the the technology is the same. Unlike an Active or Passive Distributed Antenna System (DAS), Small Cells don't require a signal source to connect back to the macro cell network. Instead, they generate their own cellular signals and communicate back to the service provider over a broadband internet connection.