LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
502
User Manual 1173.9628.02 ─ 16
In the example shown below an overflow occurs in the fourth subframe. The samples
of this subframe are discarded and subframe number 7 is measured additionally to
reach the specified statistical length of 12 slots.
Maximum number of measured subframes
The limit of 4000 measured subframes comprises mainly measured subframes inclu-
ded in a statistical length and subframes measured with the power monitor. The not
measured subframes of an active segment do not contribute. Other contributions that
"cost" subframes 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:
●
1 subframe per inactive segment
●
2 times the number of triggered segments
●
for each active segment without power monitor:
subframes in statistic count of the s 3 subframes
●
for each active segment with power monitor:
all subframes in the segment
The limit of 4000 measured subframes applies if a BB MEAS with 4 GB memory is
installed (R&S CMW-B100D or -U100D). If less memory is installed (R&S CMW-
B100A, no -U100D), the limit is 2000 measured subframes.
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 shall be used (IF power trigger or trig-
ger source configured via global trigger settings). The retrigger flags of subsequent
segments 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
135-1095-0799