Hi Ian,
I would set the thresholds to higher C/I values. You shouldn’t try to keep high codec rate such as 12.2 for wide C/I range, because it provide good MOS only for very good radio conditions.
So the thresholds settings depends on the radio conditions you have in your network.
This is for 4 codec AMR_FR and 3 codec for AMR_HR
Codecs:
AMR_FR_4750bps
AMR_FR_5900bps
AMR_FR_7400bps
AMR_FR_12200bps
AMR_HR_4750bps
AMR_HR_5900bps
AMR_HR_7400bps
Thresholds:
AMR_FR_HYST (dB) 1.5
AMR_FR_THR_1 (dB) 7.5
AMR_FR_THR_2 (dB) 11
AMR_FR_THR_3 (dB) 14
AMR_HR_HYST (dB) 1.5
AMR_HR_THR_1 (dB) 11.5
AMR_HR_THR_2 (dB) 14.5
AMR_HR_THR_3 (dB) 16
B11 MR3 Ed1.1