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ITU model for indoor attenuation
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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.
Contents
[hide]
1 Applicable to/under conditions
2 Coverage
3 Mathematical formulations
3.1 The model
3.2 Calculation of distance power loss coefficient
3.3 Calculation of floor penetration loss factor
4 Points to note
5 Further reading
6 See also
7 References
Applicable to/under conditions[edit]
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[edit]
Frequency: 900 MHz to 5.2 GHz
Floors: 1 to 3
Mathematical formulations[edit]
The model[edit]
The ITU indoor path loss model is formally expressed as:
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ITU model for indoor attenuation - Wikipedia, the free encyclopedia
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where,
L = the total path loss. Unit: decibel (dB).
f = Frequency of transmission. Unit: megahertz(MHz).
d = Distance. Unit: metre (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[edit]
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 GHz
N/A
32
22
1.3 GHz
N/A
32
22
1.8 GHz
28
30
22
4 GHz
N/A
28
22
5.2 GHz
N/A
31
N/A
60 GHz
N/A
22
17
Calculation of floor penetration loss factor[edit]
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 GHz
n
4n
15+4(n-1) 6 + 3(n-1)
2.0 GHz
n
4n
15+4(n-1) 6 + 3(n-1)
5.2 GHz
1
N/A
16
N/A
Points to note[edit]
This section is empty. You can help by adding to it. (July 2010)
Further reading[edit]
Introduction to RF propagation, John S. Seybold, 2000, John Wiley and Sons.
http://en.wikipedia.org/wiki/ITU_model_for_indoor_attenuation
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ITU model for indoor attenuation - Wikipedia, the free encyclopedia
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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.
See also[edit]
Log-distance path loss model
Radio propagation model
Young model
References[edit]
1. ^ a b 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
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