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Reply To: Carrier to Interference ratio



it’s not what design you use, but rather the speech codec you agree to use.
When using AMR FR codec with low speech bitrate, you can have a very high protection to CIR. It can go down to a C/I of 1dB while maintaining the communication. This requires AMR FR 4.75kbps.
Using the typical 12.2kbps, the call will start dropping at C/I around 6dB.

Precise values can be found in 3GPP docs 😉