LTE Signaling
R&S
®
CMW-KM5xx/-KS5xx
63
User Manual 1173.9628.02 ─ 16
Press the softkey "Multi Evaluation" followed by the hotkey "Measurement Sub-
frames" and set "No. of Subframes".
5. Press "ON | OFF" to start the measurement.
Ignore an indicated trigger timeout.
6. Configure the TPC pattern and execute it:
a) Press the "Signaling Parameter" softkey followed by the "TPC" hotkey.
b) Set "Active TPC Setup" to "3GPP Relative Power Control".
c) Set "3GPP..." > "Pattern" to the desired ramping pattern (A, B or C up or
down).
d) Press "Execute".
The TPC pattern is executed. The initial RB allocation and the RB change are con-
figured automatically. The expected nominal power is also configured automati-
cally. After completion of the TPC pattern, the RB allocation is reset to the alloca-
tion used before TPC pattern execution.
To check the measurement results, open the "Power Monitor" view.
7. To repeat the measurement with another pattern, select the pattern and press the
"Execute" button again.
2.2.19 Extended BLER Measurement
The extended BLER measurement is installed together with the "LTE Signaling" appli-
cation. To access the measurement, press the softkey "LTE RX Meas" in the LTE sig-
naling main view. Then select the tab "Extended BLER".
The measurement sends data to the UE via PDSCH subframes. It evaluates the posi-
tive ACKnowledgments (ACK) and Negative ACKnowledgments (NACK) returned by
the UE to determine the Block Error Ratio (BLER) and the throughput. The CQI indices
reported by the UE are also evaluated.
With enabled HARQ / CQI reporting, the HARQ (re-)transmissions, reported PMI val-
ues and rank indicators are also evaluated. For the uplink, the results of a Cyclic
Redundancy Check (CRC) are provided.
The measurement is especially suitable to assess the characteristics and the perform-
ance of the UE receiver at low RF power levels.
The LTE standard does not request the implementation of test loops at the UE. Bit
Error Rate (BER) measurements are therefore no issue for LTE.
2.2.19.1
Performing a BLER Measurement
To measure the downlink BLER, you must set up a connection and transfer data via
the downlink. In test mode, activate downlink padding to transfer data (see
on page 165). In data application mode, transfer data for example via
FTP.
General Description
深圳德标仪器
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