Page 347 - Integrated Wireless Propagation Models

I n - B u i l d i n g ( P i c o c e l l ) P r e d i c t i o n M o d e l s 325

30 / Ciear case

/ Shadow case
40

20 dB
50

60
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FIGURE 5.4.2.2 Ericsson n -building path-loss model at 900 MHz (From44 © I E EE).
i

5.5 ITU Model

(
5.5.1 COST 231 M u ltiwall Model E mpirical)
The COST 231 multiwall model is also an empirical model that is used for the propaga­
tion within the buildings.46 This model predicts a linear component of loss in dB, propor­
tional to the number of walls penetrated, plus a term that depends on the number of floors
penetrated, as shown below;

(5.5.1.1)

where L is the free space loss for the straight-line (direct) path between the transmitter and
F
receiver, L, is an empirically derived constant, nwi is the number of walls crossed by the
direct path of type i, W is the number of wall types, Lwi is the penetration loss for a wall
of type i, n is the number of floors crossed by the path, b is an empirical constant, and L 1
1