On 03/08/2021 15:28, Denis Kenzior wrote:
Hi Alex,
I have been chasing this up with Quectel and they tell me this the
correct implementation.
"QCOPS and QENG command show the RSSI、RSRP and SINR value of the
network, this is in accordance with the 3GPP TS regulations, so it is
normal for negative numbers to be displayed.image"
So the image shows the value for <rsrp>
'0' if -140 dbm
...
'95' if dbm is -46 to -45
etc.
<rsrp> (what is actually sent over AT commands) is never negative.
Isn't the image supporting my earlier assertion: 'AT commands do not
have a concept of negative numbers'?
oFono exposes the <rsrp> value from 3GPP:
"byte ReferenceSignalReceivedPower [optional, lte]
Contains the Reference Signal Received Power. Valid range of
values
is 0-97. Refer to <rsrp> in 27.007, Section 8.69 for more
details.
"
Regards,
-Denis
Denis - I am being directed to the ITU 36.133 spec here
https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=2420
This document defines this in 9.1.4
I can't see where RSRP_-17 is defined anywhere but the strong
implication to me is that this number should be -17
Can you confirm where it states that these numbers cannot be negative
numbers as I cannot find that requirement.
Thanks,
Alex
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