NB-IoT Multi-Evaluation Measurement
R&S
®
CMW-KM300/-KS300
204
User Manual 1178.5689.02 ─ 06
The statistical length defines the number of slots to be measured per segment. You
can measure an entire NPUSCH transmission or only a part of it. The "current" result
of a segment refers to the last measured slot of the statistical length. Additional statisti-
cal values (average, minimum, maximum and standard deviation) are calculated for the
entire statistical length. The following figure provides a summary.
Two consecutive segments are often measured at different analyzer settings. The
R&S
CMW changes the analyzer settings in the last two slots of a segment. These last
two slots of each segment are automatically excluded from the measurement.
Results of other slots that cannot be measured accurately (because of overflow, low
signal or synchronization error) can also be discarded automatically (parameter
= Off). The reached statistical length, a reliability indicator for the
measurement and a reliability indicator for the segment are included in most measure-
ment results.
Maximum number of measured slots
The limit of 4000 measured slots comprises measured slots included in a statistical
length. The not measured slots of an active segment do not contribute. Other contribu-
tions that "cost" slots are inactive segments and triggering of a segment.
All segments selected for the measurement are considered. In the worst case, the sum
of the following components must not exceed 4000:
●
One slot per inactive segment
●
Two times the number of triggered segments
●
Per active segment: Slots in the statistic count of the segment plus three slots
Trigger modes
A list mode measurement can either be triggered only once, or it can be retriggered at
the beginning of specified segments.
In "Once" mode, a trigger event is only required to start the measurement. As a result,
the entire range of segments (up to 1000) is measured without additional trigger event.
The trigger is rearmed after the measurement has been finished. The retrigger flag of
the first segment specifies which trigger source is used (IF power trigger or trigger
source configured via global trigger settings). The retrigger flags of subsequent seg-
ments are ignored.
The "Once" mode is recommended for UL signals with accurate timing over the entire
range of segments.
General Description
深圳德标仪器
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