Rohde & Schwarz CMU-K20, Operating Manual

Page: 213 / 646

CMU-K20/K21/K22/K23/K24
Signalling: Receiver Quality Measurements
1115.6088.12 4.135 E-12
b) BLER
The results of the current
Receiver Quality
measurement are displayed in the tables in the center of the
menu.
Fig. 4-62 Display of test settings and measurement results (BLER)
The measurement results are defined at the beginning of section
Receiver Quality Measurements
on
page 4.118 .
BLER /
RLC Blocks
The upper table shows the measured Block Error Ratio (BLER) in all timeslots
(Slot 0
to
Slot 7).
The number of transferred
RLC Blocks
in each slot, the
RLC
Data Rate
(see below) and the BS signal level used during the BLER
measurement
(TCH BER Level,
dBm-values to the right of the table) is indicated in
addition.
The
TCH BER Level
is not displayed for timeslots that are disabled in the slot
editor; see
Slot Configuration Editor
on p. 4.158 . Moreover, valid results are
available only in timeslots where the MS receives data from the CMU.
Note: The number of timeslots that can be evaluated simultaneously is
limited by the multislot capabilities of the DUT. The CMU can send
RLC blocks in up to 4 timeslots provided that the
B52 Mode (see p.
4.174
) is set to
Multislot Support
. With the setting
BCCH or TCH
(see
Mode
softkey on p. 4.163 ) all timeslots are available as traffic
channels.
RLC Data Rate
The RLC data transmission rate is displayed in units of kBit/s.
The
RLC Data Rate
corresponds to the net data transmission rate: Only the blocks
that are correctly received are counted so that the data rate decreases as the
BLER increases. Besides, the data rate depends on the number of bit per block
and thus on the coding scheme; see
Table 4-13
on p. 4.124 .
Over all results
The
Over all
table row shows the following statistical results:
•
The BLER averaged over all slots, i.e. the sum of the individual BLER in all
enabled slots, weighted with the number of RLC Blocks in each slot and divided
by the total number of RLC blocks.
•
The total number of RLC blocks transferred, i.e. the sum of all RLC blocks in
timeslots 0 to 7.
•
The average RLC data rate in all enabled slots.
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