The ITU indoor propagation model, also known as ITU model for indoor attenuation, is a radio propagation model that estimates the path loss inside a room or a closed area inside a building delimited by walls of any form.
Suitable for appliances designed for indoor use, this model approximates the total path loss an indoor link may experience.
Typically, such appliances use the lower microwave bands around 2.4 GHz.
Frequency: 900 MHz to 5.2 GHz Floors: 1 to 3 The ITU indoor path loss model is formally expressed as:
[1] The floor penetration loss factor is an empirical constant dependent on the number of floors the waves need to penetrate.