EP06-E SINR value


Could you please explain how the SINR value returned by the AT command AT+QENG=“servingcell” should be interpreted? Is it actually in dB or should it be further translated to dB using some formula? It is not quite clear from “AT Commands Manual”.

P.S. EP06-E module


I basically have the same question as Serge_K, Unfortunately, I don’t quite understand your answer.

Are the bold numbers raw data that serves for SINR calculation or is it the actual SINR in dB ?

+QCAINFO: “pcc”,1600,100,“LTE BAND 3”,1,473,-103,-13,-70,11
+QCAINFO: “scc”,6200,50,“LTE BAND 20”,2,222,-91,-14,-59,4

+QENG: “servingcell”,“NOCONN”,“LTE”,“FDD”,xxx,03,xxxxxx,473,1600,3,5,5,55F0,-103,-14,-68,12,-

The EP06 AT manual states

<sinr> Number format. Logarithmic value of SINR, Values are in 1/5th of a dB. Range: 0-250 which translates to -20dB - +30dB.

Kind rgds

It is the true scope of the 3gpp

SINR may also fluctuate greatly as the strength of the signal received by the terminal (RSRP) varies

Thanks for your prompt reply.

So a value of 12 like in my AT+QENG=“servingcell” query means what in dB?
Is it -17.0 dB ?

If so, such a bad value should result in a completely broken connection. My connection is working quite OK, though.

The fact that you are mentioning a range from -20 to 30 dB is confusing as some resources state that a SINR ≤0 will result in a disconnection.
Others mention different ranges. Is the range proprietary to a given modem manufacturer?


query currently camp station_cell’s signal

Thanks, I know that part of the manual. I just wanted to check whether there is a mistake :wink:

+QENG: “servingcell”,“NOCONN”,“LTE”,“FDD”,xxx,03,xxxxxx,473,1600,3,5,5,55F0,-103,-14,-68,12 ,-

So I calculate (0.2 * 12 * 10) - 20 = 4

So with a value of 12, the actual SINR is +4 dB. Correct?

Yes, the calculations are correct

OK thank you.

Have a nice day

you are welcome,you are great :smile:

Explain this:
For 0:
(0.2 * 0 * 10) - 20 = -20
For 250
(0.2 * 250 * 10) - 20 = 480

So it is over range (-20 dB +30 dB). Should by 1/5x10 - 20 OR 1/5*x-20?

According to the 3GPP specs posted earlier by herbert.pan-Q, the actual range goes from 0 to 127 in terms of measurement values. 128-254 doesn’t seem to be used and 255 means unknown/undetectable.

Although, in the 3GPP paper this range goes from ss_sinr < -23 dB to 40 dB ≤ sss_sinr
while the EP06 AT manual states a range from -20 to 30 dB.

According to 3GPP -20 dB would be 7 and +30 dB would be 107.
According to Quectel AT manual -20 dB would be 0 and +30 dB would be 250.

Statements are inconsistent. Which of these is correct?

@Keane-Q @herbert.pan-Q

Can anyone from quectel support answer the questions?