WCDMA3G_TrCHBER
Description: Transport channel bit error rate measurement
Library: 3GPPFDD 10-99, Measurement
Class: SDFWCDMA3G_TrCHBER
Parameters
Name |
Description |
Default |
Sym |
Type |
Range |
|---|---|---|---|---|---|
InfoType |
information rate type: INFO_8_kbps, INFO_16_kbps, INFO_32_kbps, INFO_64_kbps, INFO_128_kbps, INFO_256_kbps, INFO_512_kbps, DCCH_2_4_kbps, DTCH_12_2_kbps, DTCH_64_kbps, DTCH_144_kbps, DTCH_384_kbps, DTCH_2048_kbps, BCH_11_1_kbps, BCH_12_3_kbps |
INFO_8_kbps |
|
enum |
|
TTI |
transmission time interval: TTI_10ms, TTI_20ms, TTI_40ms, TTI_80ms |
TTI_10ms |
Wb |
enum |
|
IgnoreFrameNum |
number of frames to be ignored |
0 |
N |
int |
[0, ∞) |
BERWindow |
number of frames over which BER is calculated |
100 |
|
int |
[1, ∞) |
Pin Inputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
1 |
in1 |
data from input1 |
int |
2 |
in2 |
data from input2 |
int |
3 |
TF |
input transport format |
int |
Pin Outputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
4 |
BER |
output bit error rate value |
real |
Notes/Equations
- This model is used to measure the transport channel bit error rate (BER). Each firing, data of one transport block is input from two inputs and the current transport format is read from TF to indicate the valid data length. Data from the two inputs are compared and the BER is measured and output each transmission time interval (TTI). Input and output tokens are listed in the following table.
Input and Output Tokens
InfoType TTI In1/In2 Tokens TF Tokens BER Tokens INFO_8_kbps 10ms 80 1 1 20ms 160 2 1 40ms 320 4 1 80ms 640 8 1 INFO_16_kbps 10ms 160 1 1 20ms 320 2 1 40ms 640 4 1 80ms 1280 8 1 INFO_32_kbps 10ms 320 1 1 20ms 640 2 1 40ms 1280 4 1 80ms 2560 8 1 INFO_64_kbps 10ms 640 1 1 20ms 1280 2 1 40ms 2560 4 1 80ms 5120 8 1 INFO_128_kbps 10ms 1280 1 1 20ms 2560 2 1 40ms 5120 4 1 80ms 10240 8 1 INFO_256_kbps 10ms 2560 1 1 20ms 5120 2 1 40ms 10240 4 1 80ms 20480 8 1 INFO_512_kbps 10ms 5120 1 1 20ms 10240 2 1 40ms 20480 4 1 80ms 40960 8 1 DCCH_2_4_kbps 10ms 24 1 1 20ms 48 2 1 40ms 96 4 1 80ms 192 8 1 DTCH_12_2_kbps 10ms 122 1 1 20ms 244 2 1 40ms 488 4 1 80ms 976 8 1 DTCH_64_kbps 10ms 640 1 1 20ms 1280 2 1 40ms 2560 4 1 80ms 5120 8 1 DTCH_144_kbps 10ms 1440 1 1 20ms 2880 2 1 40ms 5760 4 1 80ms 11520 8 1 DTCH_384_kbps 10ms 3840 1 1 20ms 7680 2 1 40ms 15360 4 1 80ms 30720 8 1 DTCH_2048_kbps 10ms 20480 1 1 20ms 40960 2 1 40ms 81920 4 1 80ms 163840 8 1 BCH_11_1_kbps 10ms 111 1 1 20ms 222 2 1 40ms 444 4 1 80ms 888 8 1 BCH_12_3_kbps 10ms 123 1 1 20ms 246 2 1 40ms 492 4 1 80ms 984 8 1 - Model functions
The current value of transport format (TF) is read and the valid length of input data is determined.
Data from the two input ports is read; after N frames these are compared from starting point of the frame to the valid length according to the input transport format value. BER is calculated by the following algorithm:
The following figure shows the BER measurement window. Date of the two inputs are compared in bits. Suppose e0 is the total error number of the current data block f0, e1 is the total error number of the previous data block f1, eWb-1 is the total error number of the earliest data block in the BER measurement window fWb-1, and the valid data lengths of these blocks in the BER window are Li(i=0,...Wb-1),
BER Measurement
then,
The value of BER is output every TTI.
References
- 3GPP Technical Specification TS25.215 V3.0.0,"Physical Layer- Measurement (FDD)," October 1999.
- 3GPP Technical Specification TS25.302 V3.1.0,"Services Provided by the Physical Layer," October 1999.