WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
76
User Manual 1173.9657.02 ─ 11
Max. possible Throughput
Maximum possible information bit throughput of the HSDPA link. This is not a mea-
surement result, but a value calculated from the configured HS-DSCH parameters. It
depends for example on the number of HARQ processes and the inter-TTI distance.
The value is calculated under the assumption that all transmission packets are
acknowledged in the first transmission (no retransmissions necessary).
For a dual carrier scenario, it considers the sum of both carriers (maximum possible
overall throughput).
Throughput
Information bit throughput of the HSDPA link in Mbit/s and as percentage of the "Max.
possible Throughput".
Several statistical results are provided per carrier:
●
Current
: Current throughput, updated in regular, non-configurable averaging inter-
vals (smaller than a single shot statistics cycle). The averaging intervals are also
used for the scheduled results.
The current throughput is closely related to the DL BLER:
Throughput [%] = 100 – DL BLER [%]
●
Maximum/Minimum
: Maximum and minimum "Current" throughput result since the
start of the measurement
●
Scheduled
: Maximum effective throughput of the connection. This is the measured
throughput of the downlink signal. It equals the current throughput assuming that
all blocks are acknowledged in the first transmission.
The scheduled throughput is relevant for data application tests on HSDPA connec-
tions. Here the scheduled throughput generally decreases because the MAC-d
PDUs carrying the user bits do not always fill the complete MAC-hs payload. In
addition, various limitations in the network and the application protocols can
decrease the scheduled throughput.
Thus the maximum possible throughput is usually not reached for data application
tests. Instead the scheduled throughput can be reached if only ACKs are reported.
In HSDPA test mode, the scheduled throughput is expected to be equal to the
maximum possible throughput. Values larger than the maximum possible through-
put are due to averaging effects, see below.
●
Average
: Average of all "Current" values referenced to the last window size.
The fixed averaging intervals for the current and scheduled values have a variable
overlap with the DL blocks. This causes the result to jitter around the average value.
Transmissions
The table rows refer to transmissions with the 1
st
to 4
th
Redundancy Version (RV).
"Transmission" means, a sent HSDPA subframe.
It is recommended to select an RV coding sequence with up to four entries in the
HSDPA settings. If you define a longer sequence, you will nevertheless only get results
for the first four redundancy versions.
The "Sent" column indicates the percentage of transmissions with a certain redun-
dancy version, e.g. 90% transmissions with first RV, 10% with second RV.
The columns "ACK", "NACK" and "DTX" indicate the percentage of transmissions with
a certain redundancy version, that the UE has answered with ACK, NACK or not at all
(sum of the values in each row = 100%).
General Description
深圳德标仪器
135-1095-0799