LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
501
User Manual 1173.9628.02 ─ 16
4000 measured subframes; for details see
Maximum number of measured subframes
.
That means, for each measurement you select a range of up to 1000 segments to be
measured from the total range of up to 2000 configured segments.
In list mode the R&S
CMW can measure modulation results (including inband emission
and equalizer spectrum flatness results), ACLR, spectrum emission and power monitor
results. The measured quantities can be enabled or disabled individually for each seg-
ment.
A segment without any enabled measurements is called inactive segment. Inactive
segments are useful for time-consuming UE reconfiguration. For that purpose you
define alternating active and inactive segments. During the active segments you per-
form measurements. During the inactive segments you reconfigure the UE for the next
measured segment.
It is possible to measure all subframes of a segment or to exclude subframes/slots at
the beginning and/or the end of the segment. The evaluation offset specifies how many
subframes are excluded at the beginning of the segment. The statistical length defines
the number of slots to be measured. The "current" result of a segment refers to the last
measured slot of the statistical length. Additional statistical values (average, minimum,
maximum and standard deviation) are calculated for the entire statistical length. Statis-
tical length and statistical values are not relevant for power monitor measurements.
The following figure provides a summary.
Two consecutive segments are usually measured at different analyzer settings. The
R&S
CMW changes the analyzer settings in the last subframes of the first segment,
which impairs the accuracy of the measurement results for up to 3 subframes at the
end of the segment. The affected subframes/slots are automatically excluded from the
measurement.
Results of other slots that can not be measured accurately e.g. because of overflow,
low signal or synchronization error can also be discarded automatically (parameter
= Off). In that case the measurement still tries to provide results
for the specified statistical length. If not enough slots of the segment can be measured,
this results in a shorter statistical length. The reached statistical length, a reliability indi-
cator for the measurement and a reliability indicator for the segment are included in
most measurement results. TDD downlink subframes and special subframes are auto-
matically ignored and do not contribute to the (reached) statistical length.
General Description
深圳德标仪器
135-1095-0799