ADC Telecommunications Inc. F0694-011 Benutzerhandbuch
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6-17
D-620616-0-20 Rev D
CONFIDENTIAL
Estimating RF Coverage
6.5.2
RAU Coverage Distance
Use equations (1) and (2), on pages 6-15 and 6-16, respectively, to estimate the dis-
tance from the antenna to where the RF signal decreases to the minimum acceptable
level at the wireless device.
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
(4
πf/c) + PLS·log
10
(d)
(3)
Table 6-14 gives the value of the first term of Equation (3) (that is., (20log
10
(4
πf/c))
for various frequency bands.
Table 6-15 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.).
ter” (that is, objects that attenuate the RF signals, such as walls, partitions, stairwells,
equipment racks, and so.).
Table 6-14
Frequency Bands and the Value of the First Term in Equation (3)
Frequency
Band (MHz)
Mid-Band
Frequency
(MHz)
Frequency
(MHz)
20log
10
(4
πf/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 6-15
Estimated Path Loss Slope for Different In-Building Environments
Environment Type
Example
PLS for
850/900 MHz
850/900 MHz
PLS for 1800/1900/
2100/2500 MHz
2100/2500 MHz
Open Environment
very few RF obstructions
very few RF obstructions
Parking Garage, Conven-
tion Center
tion Center
33.7
30.1
Moderately Open Environment
low-to-medium amount of RF
obstructions
low-to-medium amount of RF
obstructions
Warehouse, Airport, Man-
ufacturing
ufacturing
35
32
Mildly Dense Environment
medium-to-high amount of RF
obstructions
medium-to-high amount of RF
obstructions
Retail, Office Space with
approximately 80% cubi-
cles and 20% hard walled
offices
approximately 80% cubi-
cles and 20% hard walled
offices
36.1
33.1