In June 2011, NENA approved an end-state architectural vision for NG9-1-1 in the United States that includes indoor 9-1-1 caller location sub-address elements such as building name, floor, suite, room, and seat.
In February 2014, the FCC proposed rules to improve indoor and mobile phone 9-1-1 call location accuracy, including for the first time requiring wireless carriers to provide vertical information (z axis) within three meters… read full article