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CMU-K20/K21/K22/K23/K24
Signalling: Receiver Quality Measurements
1115.6088.12 4.121
E-12
Optimizing the
BLER
measurement
The number of timeslots that can be evaluated simultaneously is limited by the
multislot capabilities of the DUT but also depends on some CMU settings. To
obtain maximum flexibility in the BLER measurement, check the following settings:
!
To ensure that the CMU can send RLC blocks in several (up to 4) timeslots set
the
B52 Mode
(see p.
4.174
) to
Multislot Support
.
!
To ensure that all 8 timeslots are available as traffic channels as soon as the
TBF connection is established, select the
BCCH or TCH
mode (see
Mode
softkey on p.
4.163
).
!
Use the
Slot Configuration Editor
(see
Fig. 4-88
on p.
4.196
) to enable the
individual BS timeslots and define the signal levels.
DBLER
measurement
The bit error rate test for PDTCHs can be modified in such a way that the MS loops
back the received data packets on a block by block basis and the CMU measures
the BER and the Data Block Error Rate (DBLER). The
Coding Scheme
of the
PDTCHs (CS1 to CS4; in circuit-switched and reduced signalling mode also the
EGPRS modulation and coding schemes MCS1 to MCS9) can be selected in the
Network
tabs of the
Connection Control
menu.
The test setup is the same as for Receiver Quality tests on circuit switched speech
or data channels: An overview of the different test settings for the DBLER
measurement on circuit switched and packet switched channels is given in the
table below.
Table 4-9 BLER and DBLER measurement settings
Main Service
Traffic Mode /
Coding Scheme
CMU Signalling
State
Signalling Channel /
Service Selection
Receiver Quality
Meas. Mode /
Application
Results
available
Circuit Switched
(GSM)
CS1 to CS4
MCS1 to MCS9
Call Established
NONE (analogous to
Reduced Signalling,
setup via ext. test
interface)
BER/DBLER
(CMU setting)
BER
USF BLER
DBLER
CRC Error
Packet Data
(Option CMU-
K42, GPRS)
CS1 to CS4
TBF Established
Reduced Signalling
Mode A (setup via
external test interface)
BER/DBLER
(automatic
selection by CMU)
USF BLER
CRC Error
Packet Data
(Option CMU-
K42, GPRS)
CS1 to CS4
TBF Established
Reduced Signalling
Mode B (setup via
external test interface)
BER/DBLER
(automatic
selection by CMU)
BER
USF BLER
DBLER
CRC Error
Packet Data
(Option CMU-
K42, GPRS)
CS1 to CS4
TBF Established
Test Mode B (full
ignaling via RF
connection)
BER/DBLER
(automatic
selection by CMU)
BER
USF BLER
DBLER
CRC Error
Packet Data
(Option CMU-
K43, EGPRS)
MCS1 to MCS9
TBF Established
Reduced Signalling
EGPRS symm./asymm.
(setup via external test
interface)
BER/DBLER
(automatic
selection by CMU)
BER
深圳德标仪器
135-1095-0799
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