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A17.3.3
A17.3.3
The use of the modified Hata Extended Hata model for indoor-indoor propagation introduces the following adjustments according to the relative location of the pair of transmitter and receiver.

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The first step is to estimate whether the transmitter and the receiver are located in the same building. This is done trough a statistic trial. Let us denote P the probability that the transmitter and the receiver are located in the same building. P is calculated according to the following scheme:

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T081T082T081
T082
Table 8182: Same-building probability

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Dist. Range
(km)

Same Building
Probability

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d<=0.02

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P = 1

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0.02

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< d <= 0.05

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P = (0.05-d)/0.03

0.05

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< d

P = 0

...

 

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Transmitter and Receiver in different buildings

When transmitter and receiver are located in different buildings, the calculation mode is similar to the indoor-outdoor propagation mode but with doubled additional values.

Median path loss

                            Image Removed                        

Mathinline
body$L_{indoor-indoor}^{hata}=L_{outdoor-outdoor}^{hata}+2\times {{L}_{ew}}$
  (Eq. 200209)

where 

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body$2\times {{L}_{ew}}=Loss_{Rx}^{wall}+Loss_{Tx}^{wall}$
  (Eq. 210)

Where  and are the attenuation due to external walls as defined in the Rx and Tx side respectively. 


Variation in path loss

                            (Eq. 202211)

Transmitter and Receiver in same building

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The corresponding median path loss is given by the following formula :

Image Removed(Eq. 203)

with

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Mathinline
body$L(indoor-indoor)=-27.6+20\log (\sqrt{{{({{h}_{2}}-{{h}_{1}})}^{2}}+{{(d)}^{2}}})+20\log (f)+fix\left( \frac{d}{{{d}_{room}}} \right){{L}_{wi}}+{{k}_{f}}^{\left[ \frac{{{k}_{f}}+2}{{{k}_{f}}+1}-b \right]}{{L}_{f}}$
 (Eq. 212)

with

      

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body${{k}_{f}}=\left| floor\left( \frac{{{h}_{2}}}{{{h}_{floor}}} \right)-floor\left( \frac{{{h}_{1}}}{{{h}_{floor}}} \right) \right|$
 (Eq. 213)

where :

Lwi         : loss of wall (default 5 dB)

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b           : empirical parameter (default 0.46)

droom           : size of the room (default 4 m)

hfloor             : height of each floor (default 3 m)

h2          : height of the transmitter receiver (m)

h1          : height  height of the receiver transmitter (m)

d           : the distance between the transmitter and receiver (m)

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