Ekahau has created small mobile battery-powered transmitters, location beacons, to improve location accuracy where poor Wi-Fi coverage exists. …
… “But in areas where there is marginal or poor wireless coverage, Ekahau location beacons can help improve location accuracy to levels previously available with expensive, proprietary systems not based on standard Wi-Fi technology. For a typical hospital environment, Ekahau location beacons can guarantee bed- and room-level accuracy in areas with poor Wi-Fi coverage, without the need to install additional Wi-Fi access points. Ekahau Wi-Fi tags recognize these location beacon signals and transmit the signal data to the RTLS server, which calculates the precise location of the Ekahau tags. The location beacons are typically mounted on a wall. Because they do not require any cabling, the location beacons can be moved around as needed to improve accuracy for a period of time or installed permanently in specific locations. ” …
Via Ekahau: Location Beacon
RFIDa: RFID Technology is an internet destination dedicated to documenting the application of radio frequency identification technologies. 
