RadioFrame Networks Inc DH2 User Manual
Method of Procedure
Equipment Commissioning
Equipment Commissioning
92
RFN_3.1 Beta
5.4 Coverage
Validation
Once the components of the RadioFrame System have been configured, use
iFTA-software, a laptop and an iDEN handset to check for regions of low signal
strength. If increasing the transmit power from one or more local RFUs does not
resolve the problem, adding another RFU is the surest remedy.
iFTA-software, a laptop and an iDEN handset to check for regions of low signal
strength. If increasing the transmit power from one or more local RFUs does not
resolve the problem, adding another RFU is the surest remedy.
5.4.1
Detailed Building Plans—RF Modeling
Testing by RFN has shown that simple Linear Attenuation Models (LAM) as
discussed in COST 231, Chapter 4 section 4.7 “Indoor Propagation Models” work
well provided they are used on a floor-by-floor basis. An attenuation coefficient of
0.62dB/m is recommended for dense, single-floor propagation, but this can
double if concrete walls are present.
discussed in COST 231, Chapter 4 section 4.7 “Indoor Propagation Models” work
well provided they are used on a floor-by-floor basis. An attenuation coefficient of
0.62dB/m is recommended for dense, single-floor propagation, but this can
double if concrete walls are present.
5.4.2 Measurement-based
Estimate
A battery-powered test transmitter can be moved between each RFU location
and a handheld signal strength meter used to monitor RSSI. This method can be
useful when RF penetration is desired through suspect walls
and a handheld signal strength meter used to monitor RSSI. This method can be
useful when RF penetration is desired through suspect walls
or where wall
construction data is lacking. Generally, this method provides good agreement
when it is used to identify regions of poor coverage rather than to establish
sufficient coverage zones. This is because it is usually inconvenient to duplicate
an RFUs’ position during initial coverage surveys.
when it is used to identify regions of poor coverage rather than to establish
sufficient coverage zones. This is because it is usually inconvenient to duplicate
an RFUs’ position during initial coverage surveys.
5.4.3
Floor Plan Estimate
Oftentimes, only simple floor plans are available for the building in which the
RFUs are to be installed. Without specifics about the building construction, such
as interior wall, floor and ceiling construction, propagation models are of limited
value. A measurement-based approach (discussed earlier) works well, but for
simple buildings, installing RFUs at the candidate locations and then testing the
results will likely be adequate. If regions of poor coverage are found, transmit
power can be increased or if necessary, additional RFUs added.
RFUs are to be installed. Without specifics about the building construction, such
as interior wall, floor and ceiling construction, propagation models are of limited
value. A measurement-based approach (discussed earlier) works well, but for
simple buildings, installing RFUs at the candidate locations and then testing the
results will likely be adequate. If regions of poor coverage are found, transmit
power can be increased or if necessary, additional RFUs added.
5.5 Site
Acceptance
Guidelines
5.5.1
Site As-Built Documentation
As-built documentation consists of the original site development documentation
with post-installation information. On the job, installers use site development
documentation for reference, to make notes, and to document completion of
each step of the installation.
with post-installation information. On the job, installers use site development
documentation for reference, to make notes, and to document completion of
each step of the installation.