Atec Anritsu-MT8221B - Manual (Page 15)

15
BTS Master™ Base Station Analyzer Features
Fixed and Mobile WiMAX Signal Analyzers (Options 0046, 0047, 0066, 0067, 0037)
RF Measurement – Preamble Power
High or low values will create larger areas of cell-to-
cell interference and create lower data rates near cell
edges. Low values affect in-building coverage.
Demodulation – Frequency Error
Calls will drop when user’s equipment travels at high
speed. In severe cases, handoffs will not be possible at
any speed, creating island cells.
Over-the-Air Measurements – PCINR
A low Physical Carrier to Interference plus Noise Ratio
(PCINR) indicates poor signal quality, low data rate and
reduced sector capacity.
Pass/Fail Test
Set up common test limits, or sets of limits, for
each instrument. Inconsistent settings between base
stations, leads to inconsistent network behavior.
RF Measurements
(Option 0046/0066, Fixed/Mobile)
Channel Spectrum
Channel Power
Occupied Bandwidth
Power vs. Time
Channel Power
Preamble Power
Downlink Burst Power (Mobile only)
Uplink Burst Power (Mobile only)
Data Burst Power (Fixed only)
Crest Factor (Fixed only)
ACPR
Demodulation (10 MHz maximum)
(Option 0047/0067, Fixed/Mobile)
Constellation
RCE (RMS/Peak)
EVM (RMS/Peak)
Frequency Error
CINR (Mobile only)
Base Station ID
Carrier Frequency
Sector ID
Spectral Flatness
Adjacent Subcarrier Flatness
EVM vs. Subcarrier/Symbol
RCE (RMS/Peak)
EVM (RMS/Peak)
Frequency Error
CINR (Mobile only)
Base Station ID
Sector ID (Mobile only)
DL-MAP (Tree View) (Mobile only)
Over-the-Air (OTA)
(Option 0037 Mobile only)
Channel Power Monitor
Preamble Scanner (Six)
Preamble
Relative Power
Cell ID
Sector ID
PCINR
Dominant Preamble
Base Station ID
Auto-Save with GPS Tagging and Logging
Fixed and Mobile WiMAX Signal
Analyzers
The BTS Master features two Fixed WiMAX
and three Mobile WiMAX measurement
modes:
• RF Measurements
• Demodulation (up to 10 MHz)
• Over-the Air Measurements (OTA)
(Mobile only)
The goal of these measurements is
to increase data rate and capacity by
accurate power settings, ensuring low
out-of-channel emissions, and good signal
quality. These attributes help to create a
low dropped call rate, a low blocked call
rate, and a good customer experience.
Cell site technicians or RF engineers can
make measurements Over-the-Air (OTA)
to spot-check a transmitter’s coverage and
signal quality without taking the cell site
off-line. When the OTA test results are
ambiguous one can directly connect to the
base station to check the signal quality
and transmitter power.
Cell ID, Sector ID, and Preamble
Cell ID, Sector ID, and Preamble show
which cell, sector, and segment are being
measured OTA. The strongest signal is
selected automatically for the additional
PCINR and Base Station ID measurement.
Wrong values for cell, sector and segment
ID lead to dropped handoffs and island
cells. If the cause is excessive coverage,
it also will lead to large areas of low data
rates.
Error Vector Magnitude (EVM)
Reletive Constellation Error (RCE)
RCE and EVM measure the difference
between the actual and ideal signal. RCE
is measured in dB and EVM in percent.
A known modulation is required to make
these measurements. High RCE and
EVM causes low signal quality, low data
rate, and low sector capacity. This is
the single most important signal quality
measurement.
Preamble Mapping (Mobile WiMAX)
Preamble Scanner can be used with
the GPS to save scan results for later
display on a map. PCINR ratio for the
strongest WiMAX preamble available at
that spot. The Base Station ID and Sector
ID information are also included so that
it’s easier to interpret the results. Once
PCINR data is mapped, it becomes much
easier to understand and troubleshoot any
interference or coverage issues.