WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
185
User Manual 1173.9657.02 ─ 11
Test Mode ← RMC
Selects the test mode (loop mode) that the UE enters after connecting to the UTRAN.
The test modes are defined in 3GPP TS 34.109.
When the R&S
CMW sets up an RMC connection it forces the UE to the UE radio
bearer test mode. The connection is fast (without Alerting) and must be initiated by the
instrument. Three different test modes are available: "No Loop", "Loop Mode 1 RLC"
and "Loop Mode 2".
In reduced signaling mode only loop mode 2 is supported. The loop must be activated
at the UE and this parameter is hidden.
Remote command:
Loop Mode 1 RLC ← RMC
Selects RLC "Transparent" mode or "Acknowledged" mode for RMC transmission with
loop mode 1.
With acknowledged mode, it is possible to perform RLC Throughput measurements.
In reduced signaling mode only loop mode 2 is supported and this parameter is hidden.
Remote command:
Loop Mode 2 Sym. UL CRC / UL CRC ← RMC
Enables or disables the uplink Cyclic Redundancy Check (CRC) for Loop Mode 2. This
setting is only relevant when an RMC with symmetric DL/UL data rate is used.
If the uplink CRC is enabled, the UE sends a 16-bit CRC sequence, the DL/UL trans-
port block size is symmetric.
If the uplink CRC is disabled, the UE sends no CRC sequence, but adds the DL CRC
to the transport block. The DL/UL transport block size is asymmetric.
For RMCs with asymmetric DL/UL data rate the setting is ignored. In that case the UL
CRC is enabled and the DL/UL transport block size is asymmetric.
Remote command:
DL Resource in Use ← RMC
Percentage of DL RMC transport blocks that are filled with information bits. The per-
centages are rounded and correspond to values 1, 1/2, 1/4, 1/6, …, 1/30, 1/32. A value
1/n means that out of n transport blocks, only one is fully filled with data, (n – 1) blocks
are empty. The effective data rate decreases by the factor n.
Restricting the DL resources can be necessary to prevent a buffer overflow in the UE,
especially in cases where BLER tests are performed with asymmetric RMCs (e.g. 384
kbps DL and 12.2 kbps UL).
Note that the uplink DPDCH is only active (and filled with data) as long as the UE
transmits data. In closed test loop mode, this implies that the UL power decreases if
the percentage of DL resources in use is reduced.
GUI Reference
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