WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
69
User Manual 1173.9657.02 ─ 11
usually be neglected. To verify this assumption for UE receiver quality measurements,
the uplink block error ratio (BLER) can be measured additionally.
UE test loops and bit error rates for conformance tests are specified in 3GPP TS
34.109.
BER Dialogs
The R&S
CMW provides a separate tab and configuration dialog for BER tests, to be
accessed from the "Measurement Controller" dialog, entry "RX Measurement...".
2.2.18.1
BER, BLER and DBLER Tests
To measure the Bit Error Rate (BER), Block Error Ratio (BLER) and Data Block Error
Rate (DBLER) you must configure an RMC connection with test loop and without
HSPA test mode. This section describes several suitable RMC and loop configurations.
The table below provides an overview of the configurations. For each configuration it
lists the results that can be measured and the required RMC and loop settings. For a
description of the corresponding parameters refer to
In reduced signaling mode, loop mode 2 with or without UL CRC is supported. Loop
mode 1 is not supported.
Below the table the configurations are described in detail.
Configu-
ration
Measured
Results
Test
Mode
RMC Data
Rate
Loop Mode 1
RLC
Loop Mode 2 Sym. UL CRC
1
BER, DBLER,
DL BLER
Loop
Mode 2
UL=DL
n/a
Disabled
2
BER, DBLER,
UL BLER
Loop
Mode 2
UL=DL
n/a
Enabled
3
BER, DBLER
Loop
Mode 2
UL < DL
n/a
Setting ignored, UL CRC enabled
Loop
Mode 1
Transparent
n/a
Acquisition error
If the UE does not close the loop and sends other data instead of looping back the
received data, this results in an acquisition error (reliability indicator value 7). For the
BER measurement an acquisition error indicates that the UL signal was decoded suc-
cessfully, but the expected bit pattern was not found.
Configuration 1: Loop Mode 2 with symmetric data rate and disabled UL CRC
This configuration is described in 3GPP TS 34.109 for BLER measurements. Its pur-
pose is to assess block errors originating in the downlink path. BER and DBLER can
also be measured.
General Description
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