The long-awaited CDMA femtocell (once dubbed the Samsung Ubicell) essentially acts as a super in-house signalbooster, or, if you'd prefer, a mini Sprint tower sitting right beside your router.
Other booster enhancements that have been proposed to the FCC include proximity detection to prevent cell tower signal overload and bi-directional signal amplification, which would improve signal transmissions from cellphones back to cell towers.