Is one of those "call the carrier" ones. You can't fix their settings or base stations.
In the GSM network, the voice quality is bad only in uplink at a site. There's a lot of noise along with the voice and the voice is not clear.No half rate is implemented at this place. The Frequency interference is already checked and the noise may not probably be due to the frequency.
There is unbalance between the uplink and downlink signals, but not that much to affect the uplink voice quality that badly.
The traffic carried by the site is also not high.
So, is there any other RF causes or parameter tuning that we can do to improve the voice quality from that place. Or, how shall I exactly determine that it is the hardware problem. Any suggestions?