Good RxQual and RxLevel but user experience is bad

[dodotiro]

Hi all huawei expert,

i have a customer complain about voice quality in 2G. i try to call him, and i found the same problem.

while calling i monitored RxLev and RxQual via M2000. i find there is no degradation of RxLev and RxQual. but the voice is turn bad and sometime disappears.

thanks

[T_ADD]

Hi all huawei expert,

i have a customer complain about voice quality in 2G. i try to call him, and i found the same problem.

while calling i monitored RxLev and RxQual via M2000. i find there is no degradation of RxLev and RxQual. but the voice is turn bad and sometime disappears.

thanks

I don't do GSM but try this troubleshooting case (on bad voice quality). It may help. From your explanation it seems like a voice discontinuity problem.

But I'm sure you'll get plenty of help here in GSM.

[RF engineer]

Hi all huawei expert,

i have a customer complain about voice quality in 2G. i try to call him, and i found the same problem.

while calling i monitored RxLev and RxQual via M2000. i find there is no degradation of RxLev and RxQual. but the voice is turn bad and sometime disappears.

thanks

Can u check on BSC side because may be the board has problem.

BR

[sohappy]

If RxLev and RxQual is ok, you need check channel type, and amr code is used because maximun SQI (Speech Quality Index) is different
HR (Half Rate): –20 ... 17 dBQ
FR (Full Rate): –19 ... 22 dBQ
EFR (Enhanced Full Rate): –20 ... 30 dBQ
AMR: Dependent on codec mode. The maximum SQI values are as follows:
12.2 kbit/s: 30 dBQ
10.2 kbit/s: 28 dBQ
7.95 kbit/s: 28 dBQ
7.40 kbit/s: 27 dBQ
6.70 kbit/s: 27 dBQ
5.90 kbit/s: 24 dBQ
5.15 kbit/s: 21 dBQ
4.75 kbit/s: 19 dBQ
So you need check on BSC, the parameter Speech Version, and all parameter in GCELLCCAMR command.
If only one customer have problem may be problem in customer's MS.

[RF engineer]

Hi all huawei expert,

i have a customer complain about voice quality in 2G. i try to call him, and i found the same problem.

while calling i monitored RxLev and RxQual via M2000. i find there is no degradation of RxLev and RxQual. but the voice is turn bad and sometime disappears.

thanks

Can u check on BSC side because may be the board has problem.

BR

[J_Ahmad]

Can be a case of Multiservers where multiple cells are serving with very good level causing high noise floor and multiple handovers resulting in poor perception for customer.