User's Manual

Estimating RF Coverage
6-10 InterReach Fusion Wideband Installation, Operation, and Reference Manual
CONFIDENTIAL D-620616-0-20 Rev A
6.5.2 RAU Coverage Distance
Use equations (1) and (2), on pages 6-8 and 6-9, respectively, to estimate the distance
from the antenna to where the RF signal decreases to the minimum acceptable level at
the wireless device.
With d
0
set to one meter and path loss slope (PLS) defined as 10n, Equation (2) can
be simplified to:
PL(d) = 20log
10
(4πf/c) + PLS·log
10
(d) (3)
Table 6-5 gives the value of the first term of Equation (3) (that is., (20log
10
(4πf/c))
for various frequency bands.
Table 6-6 shows estimated PLS for various environments that have different “clutter”
(that is, objects that attenuate the RF signals, such as walls, partitions, stairwells,
equipment racks, and so.).
By setting the path loss to the maximum allowable level (PL = APL), equation (3) can
Table 6-5 Frequency Bands and the Value of the First Term in Equation (3)
Frequency
Band (MHz)
Mid-Band
Frequency
(MHz)
20log
10
(4πf/c)
Uplink Downlink
1800 MHz DCS 1710-1785 1805-1880 1795 37.5
2.1 GHz UMTS 1920–1980 2110–2170 2045 38.7
Table 6-6 Estimated Path Loss Slope for Different In-Building Environments
Environment Type Example
PLS for
850/900 MHz
PLS for
1800/1900 MHz
Open Environment
very few RF obstructions
Parking Garage, Conven-
tion Center
33.7 30.1
Moderately Open Environment
low-to-medium amount of RF
obstructions
Warehouse, Airport, Man-
ufacturing
35 32
Mildly Dense Environment
medium-to-high amount of RF
obstructions
Retail, Office Space with
approximately 80% cubi-
cles and 20% hard walled
offices
36.1 33.1
Moderately Dense Environment
medium-to-high amount of RF
obstructions
Office Space with approx-
imately 50% cubicles and
50% hard walled offices
37.6 34.8
Dense Environment
large amount of RF obstructions
Hospital, Office Space
with approximately 20%
cubicles and 80% hard
walled offices
39.4 38.1