This invention relates to the zonal transmission of data by radio means
and optionally by optical means through the modulation of light from
common building light fixtures, including the light output of
fluorescent, mercury vapor, and other arc or discharge lamps and
fixtures; a system for the reuse of radio frequencies by smart radios,
and the accurate locating and tracking of objects or persons as they move
through a building; by means of creating a communications system which
exploits the existing infrastructure of a building to facilitate the
transmission of relatively secure control and communications data via
creation of a multiplicity of area-limited interference-free
communication zones. The system facilitates the transmission of wide-area
as well as zonal-specific data. The system facilitates the creation of a
database that contains present location and history location and movement
data of persons and objects as they move through a building.