Technical data

Chapter 20 609
W-CDMA or W-CDMA (with HSDPA) Over Air
Metrics Provided by the W-CDMA or W-CDMA (with HSDPA) Over Air
Measurement
W-CDMA or W-CDMA (with HSDPA)
Over Air
PCDE (Peak Code Domain Error)
PCDE takes the noise and projects the maximum impact it will have on all OVSF
codes. PCDE is the maximum value for the code domain error for all codes (both
active and inactive).
In W-CDMA or W-CDMA (with HSDPA), specifically to address the possibility of
uneven error power distribution, the EVM measurement has been supplemented
with PCDE. The 3GPP standard requires the PCDE not to exceed –33 dB at a
spreading factor of 256, but the Conformance Test adds in a Test Tolerance of 1dB.
This gives a Conformance Limit for Peak Code Domain Error of –32dB at a
spreading factor of 256.
Utilization
Utilization is a ratio of the active OVSF codes to the total SF512 codes, expressed as
a percentage. Even though active control channels such as the pilot are included in
the utilization measurement, utilization is an indication of the traffic that is being
carried by the base station.
For example, W-CDMA or W-CDMA (with HSDPA) signal with CPICH,
PCCPCH, SCCPCH using SF256, and PICH, would use 8 of 512 SF512 codes,
giving a utilization of 1.6%.
Pk Util (Peak Utilization)
Peak Utilization is the peak level of all the valid Utilization measurements while on
the same Scrambling code. In Scrambling code Auto mode this measurement is reset
if the Scrambling code changes or the Reset Metrics button is used. In Scrambling
code Manual mode this measurement is reset only if the Reset Metrics button is
used.
NOTE Pressing [Reset Metrics] also causes a restart of your analyzer.
Avg Util (Average Utilization)
Average Utilization is the average level of all the valid Utilization measurements
while on the same Scrambling code. In Scrambling code Auto mode this
measurement is reset if the Scrambling code changes or the Reset Metrics button is
used. In Scrambling code Manual mode this measurement is reset only if the Reset
Metrics button is used.
NOTE Pressing [Reset Metrics] also causes a restart of your analyzer.