The SIR indicates the ratio between the received signal level and the level of interference. This parameter is used in WCDMA systems to control transmission power of user equipment (UE). If the measured SIR is higher/smaller than the target SIR, the base station will command UE to increase/lower power.
| Code | Range of SIR in dB | Code | Range of SIR in dB | Code | Range of SIR in dB |
|---|---|---|---|---|---|
| 0 | <-11.00 | 22 | -0.50 to 0.00 | 44 | 10.50 to 11.00 |
| 1 | -11.0 to -10.5 | 23 | 0.00 to 0.50 | 45 | 11.00 to 11.50 |
| 2 | -10.5 to -10.0 | 24 | 0.50 to 1.00 | 46 | 11.50 to 12.00 |
| 3 | -10.0 to -9.50 | 25 | 1.00 to 1.50 | 47 | 12.00 to 12.50 |
| 4 | -9.50 to -9.00 | 26 | 1.50 to 2.00 | 48 | 12.50 to 13.00 |
| 5 | -9.00 to -8.50 | 27 | 2.00 to 2.50 | 49 | 13.00 to 13.50 |
| 6 | -8.50 to -8.00 | 28 | 2.50 to 3.00 | 50 | 13.50 to 14.00 |
| 7 | -8.00 to -7.50 | 29 | 3.00 to 3.50 | 51 | 14.00 to 14.50 |
| 8 | -7.50 to -7.00 | 30 | 3.50 to 4.00 | 52 | 14.50 to 15.00 |
| 9 | -7.00 to -6.50 | 31 | 4.00 to 4.50 | 53 | 15.00 to 15.50 |
| 10 | -6.50 to -6.00 | 32 | 4.50 to 5.00 | 54 | 15.50 to 16.00 |
| 11 | -6.00 to -5.50 | 33 | 5.00 to 5.50 | 55 | 16.00 to 16.50 |
| 12 | -5.50 to -5.00 | 34 | 5.50 to 6.00 | 56 | 16.50 to 17.00 |
| 13 | -5.00 to -4.50 | 35 | 6.00 to 6.50 | 57 | 17.00 to 17.50 |
| 14 | -4.50 to -4.00 | 36 | 6.50 to 7.00 | 58 | 17.50 to 18.00 |
| 15 | -4.00 to -3.50 | 37 | 7.00 to 7.50 | 59 | 18.00 to 18.50 |
| 16 | -3.50 to -3.00 | 38 | 7.50 to 8.00 | 60 | 18.50 to 19.00 |
| 17 | -3.00 to -2.50 | 39 | 8.00 to 8.50 | 61 | 19.00 to 19.50 |
| 18 | -2.50 to -2.00 | 40 | 8.50 to 9.00 | 62 | 19.50 to 20.00 |
| 19 | -2.00 to -1.50 | 41 | 9.00 to 9.50 | 63 | >20.00 |
| 20 | -1.50 to -1.00 | 42 | 9.50 to 10.0 | ||
| 21 | -1.00 to -0.50 | 43 | 10.0 to 10.50 |
Source: ETSI
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