LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
535
User Manual 1173.9628.02 ─ 16
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Carrier Frequency Error: offset between the measured carrier frequency and the
nominal RF frequency of the measured radio channel
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Timing Error: Difference between the actual timing and the expected timing. The
timing error measurement requires an "external" trigger signal to derive the expec-
ted timing. Suitable trigger signals are e.g. the frame trigger signal provided by the
signaling application or an external trigger fed in at the TRIG A or TRIG B connec-
tor.
The unit T
s
stands for the basic LTE time unit, see
chapter 3.2.4.1, "Resources in
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Occupied Bandwidth (OBW): width of the frequency range that contains 99% of the
total integrated power of the transmitted spectrum
With carrier aggregation, the transmitted spectrum comprises all carriers. The cen-
ter of the frequency range is the carrier center frequency / the aggregated band-
width center frequency.
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TX Power: RMS averaged power over all samples in the slot, equivalent to the sum
of the powers of all (allocated and non-allocated) RBs
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Peak Power: peak power of all samples in the slot
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RB Power: arithmetic mean value of the average powers in all allocated resource
blocks
For query of the results via remote control, see
chapter 3.5.3.27, "Modulation Results
For the parameters below the "TX Measurement" table, see
RX Measurement
For information about this measurement, refer to
The table provides the following results:
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Subframes: Number of already processed subframes and total number of sub-
frames to be processed. All downlink subframes are counted, scheduled sub-
frames as well as subframes without allocated resource blocks.
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Scheduled: Number of already measured subframes (scheduled downlink sub-
frames). If the measurement is configured correctly, this number equals the sum of
the absolute values for ACK, NACK and DTX.
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BLER: Block Error Ratio, percentage of sent scheduled subframes for which no
acknowledgment has been received. The result considers received NACK and
PDCCH decoding errors (DTX):
BLER = (#NACK + #DTX) / (#ACK + #NACK + #DTX)
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ACK / NACK / DTX: Number of acknowledgments and negative acknowledgments
received over the PUCCH. No answer at all (neither ACK or NACK) is counted as
DTX. If a PUSCH is detected instead of a PUCCH, this is counted as NACK.
The results are presented as absolute number and as percentage relative to the
number of sent scheduled subframes.
General Description
深圳德标仪器
135-1095-0799