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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

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body$L_{indoor-indoor}^{hata}=L_{outdoor-outdoor}^{hata}+2\times {{L}_{ew}}$
  (Eq. 209)

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.

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Variation in path loss

                            (Eq. 211)

Transmitter and Receiver in same building

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

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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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