Below is the details.
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Signal quality
Command: AT+CSQ
Response: +CSQ:
Description: Returns signal quality.
0
-113 dBm or less
1
-111 dBm
2 to 30
-109 to -53 dBm
31
-51 dBm or greater
99
not known or not detectable
99 not known or not detectable
A note on the RSSI (received signal strength), dBm is a decibel (logarithmic) scale with a reference of 1 milliwatt thus 0 dBm equals a received signal of 1 mW.
Signal strength is usually lower than 1 mW and therefore below 0, so the larger (closer to 0) the better signal strength.
You can convert the RSSI to dBM with
dBm = (rssi \times 2) - 113
Example
>AT+CSQ=?
+CSQ: (0-31,99),(99)
OK
>AT+CSQ
+CSQ: 14,99
Courtesy of Shapeshifter
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