Atec Anritsu-MT8221B - Manual (Page 12)

12
BTS Master™ Base Station Analyzer Features
W-CDMA/HSDPA Signal Analyzers (Options 0044, 0045 or 0065, 0035)
RF Measurements
(Option 0044)
Band Spectrum
Channel Spectrum
Channel Power
Occupied Bandwidth
Peak-to-Average Power
Spectral Emission Mask
Single carrier ACLR
Multi-carrier ACLR
Demodulation
(Option 0045 or 0065)
Code Domain Power Graph
P-CPICH Power
Channel Power
Noise Floor
EVM
Carrier Feed Through
Peak Code Domain Error
Carrier Frequency
Frequency Error
Control Channel Power
Abs/Rel/Delta Power
CPICH, P-CCPCH
S-CCPCH, PICH
P-SCH, S-SCH
HSDPA (Option 0065 only)
Power vs. Time
Constellation
Code Domain Power Table
Code, Status
EVM, Modulation Type
Power, Code Utilization
Power Amplifier Capacity
Codogram
Over-the-Air (OTA) Measurements
(Option 0035)
Scrambling Code Scanner (Six)
Scrambling Codes
CPICH
E
c
/I
o
E
c
Pilot Dominance
OTA Total Power
Multipath Scanner (Six)
Six Multipaths
Tau
Distance
RSCP
Relative Power
Multipath Power
W-CDMA/HSDPA Signal Analyzers
The BTS Master features four W-CDMA/
HSDPA measurement modes:
• RF Measurements
• Demodulation (two choices)
• 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 Node B
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.
Frequency Error
Frequency Error is a check to see that the
carrier frequency is precisely set. The BTS
Master can accurately measure Carrier
Frequency Error OTA if the instrument is
GPS enabled or in GPS holdover. Calls will
drop when mobiles travel at higher speed.
In some cases, cell phones cannot hand off
into, or out of the cell.
Peak Code Domain Error (PCDE)
Peak Code Domain Error is a measure of
the errors between one code channel and
another. High PCDE causes dropped calls,
low signal quality, low data rate, low sector
capacity, and blocked calls.
Multipath
Multipath measurements show how many,
how long, and how strong the various
radio signal paths are. Multipath signals
outside tolerances set by the cell phone
or other UE devices become interference.
The primary issue is co-channel
interference leading to dropped calls and
low data rates.
Pass/Fail Mode
The BTS Master stores the five test models
covering all eleven test scenarios specified
in the 3GPP specification (TS 25.141)
for testing base station performance
and recalls these models for quick easy
measurements.
RF Measurements – Spectral Emissions Mask
The 3GPP spectral emission mask is displayed. Failing
this test leads to interference with neighboring carriers,
legal liability, and low signal quality.
Demodulation – Error Vector Magnitude (EVM)
This is the single most important signal quality
measurement. Poor EVM leads to dropped calls, low
data rate, low sector capacity, and blocked calls.
Over-the-Air Measurements – Scrambling Codes
Too many strong sectors at the same location creates
pilot pollution. This leads to low data rate, low
capacity, and excessive soft handoffs.
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