CDMA2000 1X Base Station Troubleshooting Guide – utilizing Anritsu’s Handheld BTS Master™, Cell Master™, or Spectrum Master™ with Options 35/44/65
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Use BTS Over-the-Air (OTA) tests to spot-
check a transmitters’ coverage and signal
quality. Use the Direct Connect tests to check
transmitter power and when the OTA test
results are ambiguous.
Found
good
spot?
Find location with
high pilot dominance,
low multipath
Run Signal
Quality Tests
SEM, ACPR
Passes?
OTA Rho
Passes?
RMS
Phase Error
Passes?
OTA Start
Start
Direct Connect
Transmitter
Test
N
Y
N
Fix frequency
reference
N
N
N
Y
Y
Y
Y
Start
Direct Connect
Transmitter
Test
Freq.
Error
Passes?
Carrier
Feedthrough
Passes?
Done
N
Y
Troubleshooting Hints
These two tables provide guidance from the first indication of a fault, a poor Key Performance
Indicator (KPI), to the BTS or Spectrum Master test, and finally, to the field replaceable unit.
Key Performance
Indicators vs. Test
Pilot
Pwr
ACPR
&
SEM
Rho
RMS
Phase
Error
Freq
Error
Carrier
Feed-
through
Code
Noise
Floor
Rx
Noise
Floor
Ec/Io
OTA
Pilot
Power
Excess
PN
Codes
Multi-
path
Call Blocking/Denial
Power shortage
x
x
xx
Code Shortage
x
xx
x
xx
x
x
UL Interference
x
x
x
Call Drop
Radio Link Timeout
x
x
x
x
x
x
x
x
x
x
x
UL Interference
x
x
DL Interference
x
x
x
x
x
x
x
x
x
x
x
Test vs. BTS Field
Replaceable Units
Freq Ref
Ch
Cards
MCPA
Filter
Antenna
Antenna
Down Tilt
Uplink
Inter-
ference
Pilot Power
xx
x
x
Adjacent Channel Power Ratio
x
x
xx
x
Spectral Emission Mask
x
x
xx
x
Rho
x
xx
x
x
RMS Phase Error
xx
x
Frequency Error
xx
Carrier Feedthrough
xx
Code Noise Floor
x
x
x
Rx Noise Floor
x
x
x
x
xx
Ec/Io
x
x
xx
x
Pilot