WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
71
User Manual 1173.9657.02 ─ 11
Fig. 2-13: Loop mode 2, UL CRC enabled (RMC with 12.2 kbps)
The results are calculated as follows:
●
UL BLER
: The R&S
CMW compares the looped-back DL Data’ with the UL CRC
calculated by the UE (UL CRC check). The UL BLER is equal to the ratio of blocks
with failed UL CRC check to the total number of blocks. The result is independent
of errors introduced in the downlink path.
●
DBLER
: The R&S
CMW checks whether the UL CRC calculated by the UE is
equal to the DL CRC and divides the number of detected data block errors by the
total number of transferred blocks.
●
BER
: The R&S
CMW compares the looped-back DL Data' to the transmitted DL
Data.
To ensure that the DL results BER and DBLER are not distorted by transmission errors
in the UL, blocks with failed UL CRC check are not considered for the calculation of
BER and DBLER.
Configuration 3: Asymmetric RMC data rates
Receiver quality tests at high data rates are to ensure that the UE receiver perform-
ance does not deteriorate under stress conditions. With asymmetric RMC data rates,
the BER and DBLER can be measured even if the UE does not support high data rates
in the uplink.
The transport block size increases with the data rate. Thus both the UL data rate and
the UL transport block size are smaller than the DL data rate and DL transport block
size. The UL CRC is enabled. Both loop mode 1 with RLC transparent mode and loop
mode 2 can be used.
Assume that the DL data rate corresponds to N + n information bits per block, the
smaller UL data rate to N information bits per block. Out of the N + n received bits, the
UE loops back N bits plus a new UL CRC.
General Description
深圳德标仪器
135-1095-0799