Hytera DMR System Planner
50
2.7.2.4 Multilayer
coverage
This scheme is designed for a high-rise building or a deep well. It involves multiple
sites standing close from each other and overlapping coverage is present on a large
scale. Since the coverage of each site is limited due to unfavorable geology
conditions, frequency reuse is seldom available, and quick signal attenuation occurs
frequently. However, different color codes are required for roaming services. With
this scheme, a user may be within the coverage of one or two sites at the same time,
and it takes about 1 minute to move from one site to another.
TX=F1
RX=F2
CC=1
TX=F3
RX=F4
CC=2
TX=F5
RX=F6
CC=3
TX=F7
RX=F8
CC=4
TX=F1
RX=F2
CC=1
TX=F3
RX=F4
CC=2
TX=F5
RX=F6
CC=3
TX=F7
RX=F8
CC=4
Figure
2.7.2.4-1
:
Multilayer Coverage
To set the RSSI threshold, the actual site configuration must be considered. For
example, the threshold can be set to the lowest value (-120dBm) for
non-overlapping coverage, because the terminal does not need to roam as long as it
is within the coverage. For multilayer coverage, the threshold can be set a higher
value. In this way, the terminal can search for stronger sites. The table below lists
reference values for the four typical site configurations. In actual applications, a
combination of site configuration may be used. Therefore, the system designer
should take all configurations into consideration and set an appropriate value.
Site Configuration
Recommended
RSSI threshold
% of Outer Range Radio Will
Roam
Non-overlapping Coverage -120dBm
0
Linear Coverage
-110dBm
10%
Overlapping Coverage
-108dBm
20%
Multilayer Coverage
-102dBm
50%
Summary of Contents for PD70X Series
Page 1: ...DMR System Planner ...
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Page 4: ...Revision History Version Date Description Remarks R1 0 November 21 2012 Initial release ...
Page 126: ...Hytera DMR System Planner 122 Figure 1 4 Analog to digital Conversion 2 ...
Page 174: ...Hytera DMR System Planner 170 For your notes ...
Page 178: ...Hytera DMR System Planner 174 For your notes ...
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