S4513: TRX_EXT_VQI_INIT_RANK_RPT_NUM
S4514: TRX_EXT_VQI_050_RANK_RPT_NUM
S4515: TRX_EXT_VQI_100_RANK_RPT_NUM
S4516: TRX_EXT_VQI_150_RANK_RPT_NUM
S4517: TRX_EXT_VQI_200_RANK_RPT_NUM
S4518: TRX_EXT_VQI_250_RANK_RPT_NUM
S4519: TRX_EXT_VQI_300_RANK_RPT_NUM
S4520: TRX_EXT_VQI_350_RANK_RPT_NUM
S4521: TRX_EXT_VQI_400_RANK_RPT_NUM
S4522: TRX_EXT_VQI_450_RANK_RPT_NUM
S4523: TRX_EXT_VQI_500_RANK_RPT_NUM
When decoding the customized extended MR or pre-processed customized extended MR from the BTS, the BSC checks whether the VQI cell is contained in the MS. If the cell is contained, the BSC decodes current VQI.
VQI is the MOS score of the voice quality.
When the BTS reports the VQI value, the VQI value is sent to the BSC after being multiplied by 50 and converted into an integer because it is a floating point value. After the BSC receives the VQI value, the VQI value ranges from 0 to 5.1 after being divided by 50. The measurement is performed with VQI 0.5 as a level. The number of VQI 0–0.5 level measurement reports indicates the number of measurement reports with the voice quality smaller than 0.5. Other levels are measured in the same way.
A specified counter is incremented by one based on the VQI.
VQI establishes the mapping between radio performance and voice quality and uses the MOS analysis method to provide the rankings of voice quality. MOS is used to assess the quality of the middle- and low-rate voice coding. The MOS value ranges from 1 to 5.
Based on the MOS analysis method, the voice quality is further classified into 11 levels for collecting traffic statistics, as listed in the following table:
Level |
Description |
|---|---|
Initial level |
voice quality < 0.5 |
Level 1 |
0.5 ≤ voice quality < 1.0 |
Level 2 |
1.0 ≤ voice quality < 1.5 |
Level 3 |
1.5 ≤ voice quality < 2.0 |
Level 4 |
2.0 ≤ voice quality < 2.5 |
Level 5 |
2.5 ≤ voice quality < 3.0 |
Level 6 |
3.0 ≤ voice quality < 3.5 |
Level 7 |
3.5 ≤ voice quality < 4.0 |
Level 8 |
4.0 ≤ voice quality < 4.5 |
Level 9 |
4.5 ≤ voice quality < 5.0 |
Level 10 |
voice quality ≥ 5.0 |
After receiving a customized extended MR or pre-processed customized extended MR from the BTS, the BSC decodes the MR. The specified counter is measured based on the VQI (N ≤ VQI < M) when the VQI cell is contained in the MS and the BSC decodes the value of the VQI. M and N refer to the level described above. M ranges from 0 to 5, N ranges from 0.5 to 5.1.
Measurement object: TRXs.
This is an original counter without involving any formula.