Technical data

614 Chapter 20
W-CDMA or W-CDMA (with HSDPA) Over Air
Interpretation of Over the Air Measurement Results
W-CDMA or W-CDMA (with HSDPA)
Over Air
peak traffic rates at this base station are getting very high. It is possible that calls
could be getting blocked or dropped.
Avg Util (Average Utilization)
If the Average Utilization of this base station is greater than 45%, the base station is
carrying a great deal of traffic. Service providers may want to consider expanding
their network infrastructure to support higher system (call) demands.
Chan Pwr (Channel Power)
If the Channel Power level is not as expected, check pilot dominance and the
number of Scramble codes visible. All visible sectors will contribute to channel
power. Also, check Amplifier Capacity and Utilization as they could have exceeded
the maximum capacity. A high power data call could be indicated by a very wide
and tall bar.
CPICH (Common Pilot Channel)
CPICH will vary with distance from the base station and clear line of sight to the
antenna. If the CPICH is not as expected, check pilot dominance and base station
settings (ratio to other control channels should be good).
Amp Cap (Amplifier Capacity)
The Amplifier Capacity metric provides an instantaneous reading of how much of
the amplifier's capacity is currently being used. More meaningful information is
provided by the Peak and Average Amplifier Capacity metrics gathered over a 10 to
15 minute interval.
Pk Amp Cap (Peak Amplifier Capacity)
If the Peak Amplifier Capacity is greater than 100%, the traffic at this base station
has caused the base station amplifier to exceed its maximum power rating. This is
not desirable as this problem can result in system degradation or damage to the
amplifier.
You can get an indication of how often the amplifier capacity is being exceeded by
watching the Amplifier Capacity measurement. This is an instantaneous
measurement of the amplifier capacity.
Avg Amp Cap (Average Amplifier Capacity)
If the Average Amplifier Capacity is greater than 85%, the base station power
amplifier is close to its maximum power limit. Further increase in traffic on this base
station could cause system performance problems or damage to the power amplifier.