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LTE Multi Evaluation Measurement
R&S
®
CMW-KM5xx/-KS5xx
499
User Manual 1173.9628.02 ─ 16
3.2.2.1
Test Setup
The downlink RF generator signal of the R&S
CMW is fed to the input of the DUT. The
R&S
CMW measures the uplink signal. Most conveniently, a bi-directional connection
with a single coax cable is used. The DUT is connected to one of the RF input connec-
tors (RF COM) at the front panel of the R&S
CMW. No additional cabling and no exter-
nal trigger is needed.
The input level ranges of all RF COM connectors are identical.
Fig. 3-4: Test setup for RX tests
3.2.2.2
Performing an LTE RX Measurement
The R&S
CMW uses the ARB generator to send data to the receiver of the UE under
test, transmitting a configurable number of PDSCH subframes. The UE is requested to
acknowledge the correct reception of each subframe. The conditions for the ARB file
are quite general, however, the UE must return the positive ACKnowledgement (ACK)
or Negative ACKnowledgement (NACK) messages over the PUCCH using format F1a.
The R&S
CMW calculates the BLER from the received ACKs, NACKs and missing
answers (DTX). As the transmit time interval for LTE equals one subframe, a subframe
corresponds to one transport block.
To synchronize the measurement to the ARB generator signal, an appropriate marker
in the ARB file is recommended as a trigger source.
To perform an LTE BLER test, proceed as follows:
1. Establish the basic test setup for RX tests, connecting the UE under test to an RF
COM connector.
2.
Generator:
Open the "GPRF Generator" application and start an LTE ARB file:
Select "Baseband Mode: ARB" and press the "ARB > Select ARB File..." hotkey to
open a dialog from where you can select the file. Press "ON | OFF" to turn on the
RF generator.
3.
Measurement:
Open the "LTE Multi Evaluation" measurement application and
enable the BLER measurement ("Multi Evaluation > Assign Views > BLER: ON").
4. Select "Measurement Control > PUCCH Format: F1a". This also ensures that a TX
measurement which runs in parallel to the BLER test is configured in accordance
with the expected UL signal.
General Description
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135-1095-0799