Technical data

610 Chapter 20
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
Chan Pwr (Channel Power)
Channel Power is the integrated power within a defined bandwidth. For W-CDMA
or W-CDMA (with HSDPA) the channel bandwidth is 3.84 MHz. Channel Power
measures the power the base station is transmitting across the entire 3.84 MHz
W-CDMA or W-CDMA (with HSDPA) channel.
CPICH (Common Pilot Channel)
Common Pilot Channel (CPICH) is the channel that carries the scrambling code.
The CPICH metric reports the power in this channel in dBc. By default, the CPICH
Limits are set to Off. If you set CPICH Limits On, the default upper limit value is
0 dBc, and the lower limit value is –20 dBc.
NOTE The CPICH default limits are set at a level suitable for catching only gross errors
when field testing live signals. To perform conformance testing, you will need to set
the limits to your own specifications. Conformance testing for Test Model 2 (TM2),
for example, requires that the CPICH limits are set to ±2.9 dB, that is, to –7.1 dB
and –12.9 dB with a –10 dBc signal.
Amp Cap (Amplifier Capacity)
Assuming the Amplifier Capacity parameters are set properly, the Amplifier
Capacity measurement is an estimate of the amount of power amplifier capacity that
is being used, expressed in percent of maximum. When an amplifier is transmitting
at maximum output power, it is said to be at 100% of its capacity. For example, an
amplifier with a maximum output power of 12 watts would be at 50% of capacity
when transmitting 6 watts and at 100% of capacity when transmitting at 12 watts.
The percentage of amplifier capacity generally increases as the number or level of
the traffic channels increase.
Pk Amp Cap (Peak Amplifier Capacity)
Peak Amplifier Capacity is the peak level of all the valid Amplifier Capacity
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 Amp Cap (Average Amplifier Capacity)