Atec Anritsu-MT8221B - Manual (Page 14)

14
BTS Master™ Base Station Analyzer Features
CDMA2000 1xEV-DO Signal Analyzers (Options 0062, 0063, 0034)
RF Measurements – Pilot and MAC Power
High values will create pilot pollution. High or low
values will cause dead spots/dropped calls and cell
loading imbalances/blocked calls.
Demodulation – Frequency Error
Calls will drop when mobiles travel at higher speed. In
some cases, cell phones cannot hand off into, or out of
the cell, creating island cells.
Over-the-Air Measurements – Multipath
Too much Multipath from the selected PN Code is the
primary issue of co-channel interference leading to
dropped calls and low data rates.
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 0062)
Channel Spectrum
Channel Power
Occupied Bandwidth
Peak-to-Average Power
Power vs. Time
Pilot & MAC Power
Channel Power
Frequency Error
Idle Activity
On/Off Ratio
Spectral Emission Mask
Multi-carrier ACPR
Demodulation
(Option 0063)
MAC Code Domain Power Graph
Pilot & MAC Power
Channel Power
Frequency Error
Rho Pilot
Rho Overall
Data Modulation
Noise Floor
MAC Code Domain Power Table
Code
Status
Power
Code Utilization
Data Code Domain Power
Active Data Power
Data Modulation
Rho Pilot
Rho Overall
Maximum Data CDP
Minimum Data CDP
Over-the-Air (OTA) Measurements
(Option 0034)
Pilot Scanner (Nine)
PN
E
c
/I
o
Tau
Pilot Power
Channel Power
Pilot Dominance
Mulitpath Scanner (Six)
E
c
/I
o
Tau
Channel Power
Multipath Power
EV-DO Signal Analyzers
The BTS Master features three EV-DO
measurement modes.
• RF Measurements
• Demodulation
• Over-the Air Measurements (OTA)
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.
Spectral Emission Mask (SEM)
SEM is a way to check out-of-channel
spurious emissions near the carrier. These
spurious emissions both indicate distortion
in the signal and can create interference
with carriers in the adjacent channels.
Faults leads to interference and thus, lower
data rates for adjacent carriers. Faults
also may lead to legal liability and low
in-channel signal quality.
Rho
Rho is a measure of modulation quality.
Rho Pilot, Rho Mac, and Rho Data are the
primary signal quality tests for EV-DO
base stations. Low Rho results in dropped
calls, low signal quality, low data rate, low
sector capacity, and blocked calls. This is
the single most important signal quality
measurement.
PN Codes
PN Code overlap is checked by the pilot
scanner. Too many strong pilots create
pilot pollution which results in low data
rate, low capacity, and excessive soft
handoffs.
Over-the-Air (OTA) Pilot Power
OTA Pilot Power indicates signal strength. Low
OTA Pilot Power causes dropped calls, low data
rate, and low capacity.