LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
503
User Manual 1173.9628.02 ─ 16
In "Segment" mode, the retrigger flag of each segment is evaluated. It defines whether
the measurement waits for a trigger event before measuring the segment, or not and
which trigger source shall be used. For the first segment, the value OFF is interpreted
as ON.
Retriggering the measurement is recommended, if the timing of the first subframe of a
segment is inaccurate, for example because of signal reconfiguration at the UE. Fur-
thermore, retriggering from time to time can compensate for a possible time drift of the
UE.
In the following example, the "Segment" mode is enabled. The measurement stops
when the second segment has been captured and waits for a trigger event from the
globally configured trigger source, before capturing the third segment. After the third
segment, it waits for a trigger event from the IF power trigger source, before capturing
the fourth segment.
Spectrum measurements
Segments with active spectrum measurements and channel bandwidths > 10 MHz are
divided into three parts. The first part is measured using the nominal carrier frequency
and is evaluated for all enabled measurements. The other two parts are only evaluated
for spectrum measurements and are used to measure the band edges.
The maximum statistical length reachable in such a segment is only one third of the
statistical length reachable with disabled spectrum measurements. Assign more sub-
frames to reach a higher statistical length. The minimum length of such a segment
equals 12 subframes. If you configure a shorter statistical length this has the same
effect as disabling the spectrum measurements for the segment.
Configuration of segments and measurement
Segment configuration and measurement are independent from each other. To per-
form a sequence of measurements at maximum speed, proceed as follows:
1. Configure all segments ever needed.
The R&S
CMW supports a range of up to 2000 configured segments.
2. Select up to 1000 consecutive segments within the configured segment range
(consider the maximum number of measured subframes).
General Description
深圳德标仪器
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