No, no, that is not what I meant by the question.
Have you done any active experimentation or study to solve your problem?
In my experiments under the same conditions as yours, the SNR is positive up to an RSSI of -110 dBm. When the RSSI is below -110 dBm and the SNR is negative, the receiver can still receive without any problems. However, when the RSSI drops to around -115 dBm and the SNR begins to drop below -6 dB, the receiver is completely unable to receive packets.
I suspect that there is a problem with your reception environment or your code.