Page 346 - Integrated Wireless Propagation Models

324 C h a p t e r F i v e

I
L - - -
­
-
r
' X Fixed stations (900 MHz)
'
'- - -
0 Fixed stations (1800 MHz)
. - -
1
I
L.. - -
""'-..;---"-�--r-' _ P _ -,1 2 rrr _ _
I ,.....-..;
I Q I I I
1 I I I
FIGURE 5.4.2.1 Building plan of the measurements.

Distance (m) Lower Limit of Path Loss [dB] Upper Limit of Path Loss [dB]
1 < r < 10 30 + 20 log r 30 + 40 log r
10 � r < 20 20 + 30 log r 40 + 30 log r
20 � r < 40 -19 + 60 log r 1 + 60 log r
40 � r -115 + 120 log r -95 + 120 log r

TABLE 5.4.2.1 Ericsson I n door Propagation Model

The two curves are shown in Fig. 5.4.2.2, one for clear case and the other for
shadow case. The gap between the two curves indicates a 20-dB shadow variation.
The transmitter located in the middle of a corridor and the receiver is in rooms along
other corridors on the same story and on other stories. The model covers the condi­
tions from a straight line along a corridor and a 45° angle across the house on the
same floor. In the model, an additional isolation between the floors was at least 15 dB
on average except for rooms that were located parallel across the open space, which
was closed to the next building. In this open space case, an added isolation between
the floors was set to 10 dB. In the vertical direction propagation, all channels can be
reused after every three floors.
The in-building model has a rapidly increasing path-loss slope, starting from a
power exponent of two over a range from 1 to 10 m, and reaches a power exponent
of 6.6 from 20 to 40 m. The shadowing distribution in the in-building model is
limited by the lower boundaries. A typical prediction from the model is shown in
1
Fig. 5.4.2.2 for 900 MHz. The model can be used at 8 00 MHz by adding an extra
path loss of 8.5 dB at all distances.