User's Manual

Estimating RF Coverage
6-18 InterReach Fusion Wideband Installation, Operation, and Reference Manual
CONFIDENTIAL D-620616-0-20 Rev E
6.5.2 RAU Coverage Distance
Use equations (1) and (2), on pages 6-16 and 6-17, respectively, to estimate the dis-
tance 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 6-16 gives the value of the first term of Equation (3) (that is., (20log
10
(4πf/c))
for various frequency bands.
Table 6-17 shows estimated PLS for various environments that have different “clut-
ter” (that is, objects that attenuate the RF signals, such as walls, partitions, stairwells,
equipment racks, and so.).
Table 6-16 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
800 MHz SMR 806-824 851-869 838 30.9
850 MHz Cellular 824-849 869-894 859 31.1
1800 MHz DCS 1710-1785 1805-1880 1795 37.5
1900 MHz PCS 1850-1910 1930-1990 1920 38.1
2.1 GHz UMTS 1920–1980 2110–2170 2045 38.7
1.7/2.1 GHz AWS 1710-1755 2110-2155
2132.5
a
a. Due to the wide frequency spread between the Uplink and Downlink bands, the mid-band frequency
of the Downlink band was chosen for 1.7/2.1 GHz AWS.
39.0
2.5 GHz WiMAX 2496-2690 2496-2690 2595 40.7
Table 6-17 Estimated Path Loss Slope for Different In-Building Environments
Environment Type Example
PLS for
850/900 MHz
PLS for 1800/1900/
2100/2500 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