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ITU Model For Indoor Attenuation

The ITU indoor propagation model estimates path loss inside rooms or buildings delimited by walls. It approximates total path loss for indoor wireless links between 900MHz and 5.2GHz over 1 to 3 floors. The model expresses path loss (L) as a function of frequency (f), distance (d), a distance power loss coefficient (N), number of floors (n), and a floor penetration loss factor. It provides empirically derived values for N and the floor penetration factor based on building type and frequency band.

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346 views3 pages

ITU Model For Indoor Attenuation

The ITU indoor propagation model estimates path loss inside rooms or buildings delimited by walls. It approximates total path loss for indoor wireless links between 900MHz and 5.2GHz over 1 to 3 floors. The model expresses path loss (L) as a function of frequency (f), distance (d), a distance power loss coefficient (N), number of floors (n), and a floor penetration loss factor. It provides empirically derived values for N and the floor penetration factor based on building type and frequency band.

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chuck333
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ITU model for indoor attenuation

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.

Applicable to/under conditions


This model is applicable to only the indoor environments. Typically, such appliances use the lower
microwave bands around 2.4 GHz. However, the model applies to a much wider range.

Coverage
Frequency: 900 MHz to 5.2 GHz

Floors: 1 to 3

Mathematical formulations

The model

The ITU indoor path loss model is formally expressed as:

where,

L = the total path loss. Unit: decibel (dB).


f = Frequency of transmission. Unit: megahertz(MHz).
d = Distance. Unit: meter (m).
N = The distance power loss coefficient.
n = Number of floors between the transmitter and receiver.
Pf(n) = the floor loss penetration factor.

Calculation of distance power loss coefficient

The distance power loss coefficient, N is the quantity that expresses the loss of signal power with distance.
This coefficient is an empirical one. Some values are provided in Table 1.[1]
Frequency band Residential area Office area Commercial area

900 MHz N/A 33 20

1.2–1.3 GHz N/A 32 22


1.8–2.0 GHz 28 30 22

4 GHz N/A 28 22

5.2 GHz 30 (apartment), 28 (house) 31 N/A


5.8 GHz N/A 24 N/A

6.0 GHz N/A 22 17

Calculation of floor penetration loss factor

The floor penetration loss factor is an empirical constant dependent on the number of floors the waves need
to penetrate. Some values are tabulated in Table 2.[1]

Frequency band Number of floors Residential area Office area Commercial area

900 MHz 1 N/A 9 N/A


900 MHz 2 N/A 19 N/A

900 MHz 3 N/A 24 N/A

1.8–2.0 GHz n 4n 15+4(n-1) 6 + 3(n-1)


5.2 GHz 1 N/A 16 N/A

5.8 GHz 1 N/A 22 (1 floor), 28 (2 floors) N/A

See also
Log-distance path loss model
Radio propagation model
Young model

References
1. Propagation data and prediction methods for the planning of indoor radio communication
systems and the radio local area networks in the frequency range 900 MHz to 100 GHz, ITU-
R Recommendations, Geneva, 2001

Further reading
Introduction to RF propagation, John S. Seybold, 2000, John Wiley and Sons.
Propagation data and prediction methods for the planning of indoor radio communication
systems and the radio local area networks in the frequency range 900 MHz to 100 GHz, ITU-
R Recommendations, Geneva, 2001.
Propagation data and prediction methods for the planning of indoor radiocommunication
systems and radio local area networks in the requency range 900 MHz to 100 GHz,
Recommendation ITU-R P.1238-7, Geneva, 2012
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