User's Manual

Estimating RF Coverage
InterReach Fusion Wideband Installation, Operation, and Reference Manual Page 85
D-620616-0-20 Rev K • TECP-77-044 Issue 9 • March 2015 © 2015 TE Connectivity
Equation 3—RAU Coverage Distance
Use “Equation 1” on page 83 and “Equation 2—Path Loss Equation” on page 84 to estimate the
distance from the antenna to where the RF signal decreases to the minimum
acceptable level at
the wireless device.
Equation 2 can be simplified to Equatio
n 3, with d
0
set to one meter and Path Loss Slope (PLS)
defined as 10n:
PL(d) = 20log
10
(4πf/c) + PLS·log
10
(d)
Table 72 gives the value of the first term of Equation 3 (that is, (20log
10
(4πf/c)) for various
frequency bands.
Table 73 shows estimated PLS for various environments that have different “clut
ter” (that is,
objects that attenuate the RF signals, such as walls, partitions, s
tairwells, equipment racks, and so
forth).
Table 72.
Frequency Bands and the Value of the First Term in Equation 3
Frequency Band (MHz) Mid-Band
Frequency
(MHz)
20log10(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* 39.0
2.5 GHz TDD LTE 2496-2690 2496-2690 2595 40.7
* Due to the wide frequency spread between the Uplink and Downlink ban
ds,
the mid-band frequency of the Downlink band was chosen for 1.7/2.1 GHz
AWS.
Table 73. 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, Convention Center 33.7 30.1
Mod
erately Open Environment
low-to-medium amount of RF obstructions
Warehouse, Airport, Manufacturing 35 32
Mildly Dense Environment
medium-to-high amount of RF obstructions
Retail, Office Space with approximately 80%
cubicles
and 20% hard walled offices
36.1 33.1
Moderately Dense Environment
medium-to-high amount of RF obstruction
s
Of
fice Space with approximately 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 an
d 80% hard walled offices
39.4 38.1