Hi all, I've tried the Field Test mode today and it seems to have changed a lot and I can no longer find RSRQ and rsrp0 and rsrp1 etc on LTE - so I can't get measurements for 4G where I am in the UK whereas I could before - does anybody have any idea as to how to get the measurements now, please? And/or does anybody know of a good and free iPhone app that I can get that does it all? Thanks a lot, Gavin
It seems to me that the RSRQ is under "Serving Cell Measurement" and then "Measured RSRQ". My value is -30 with 2 bars. Maybe the latest IOS update to 15.1 corrected the issue you reported?
Been playing around with this and under LTE - Neighbor Cell Measure - there is a nbr_RSRP with a positive number like 25 that changes with my cell connection. When I go to zero bars the number goes way down almost to zero and when connection in bars and Mbps goes up so does the number like 25 or 33 for instance. Not sure how this reads in db’s but the RSPQ does the same. Just a thought…
Might have an answer. Ref. my previous post…
RSRP means Reference Signal Received Power. It is a measurement of received power on an LTE network and is given as an ASU - Arbitrary Strength Unit - number. It is a value proportional to the received signal strength measured by the mobile phone. This ASU number can be converted to the received dbm value. The ASU number is the one found in LTE - Neighbor Cell Measure - nbr_ rsrp
There is a formula for each network and the simple formula for LTE is the ASU number subtracted by 141.
Example ASU of 26. - 141 = -115 dbm…
If you have an LTE connection only try it, see how it works for you… Thoughts?
Hey Gavin,
The formula is something else, but found this conversion chart. Much, much easier than the formula. Find your positive number and you have your conversion RSRQ number. Works for me. Don’t forget, this is just for LTE only…
Glenn
FWIW, here in the States, *3001#12345#* is still working on an iPhone Xs running iOS 15.0.
Hi gavinfromsevenoaks,
I noticed this today when completing a 4G survey.
Annoying that this feature has been removed.
Thanks for both of your messages and will give that one a go. In the meantime, I found that Android has some highly regarded apps and so I got hold of an old Samsung from my Mum and have found a free app that is absolutely brilliant - so I changed my SIM to that phone for the shortest time possible! Happy to share details, if you'd both like it. Ideally, the iPhone would return the functionality!
Hiya - this is very interesting. Have just tried and, yes, I see how your calculations come up with the kind of number I'd expect. Is there also a formula for the nbr_rsrq below, in that case? And how does this correspond with the primary tower you'd be connecting to if this is measuring the secondary - or am I wrong in assuming that? Or is it just a guide for the respective area? Thanks again and much appreciated, Gavin
but where is the rsrp0/1 information
Brill - great info, Glenn!
Thanks Gavin, you are to kind, just glad to help out a fellow apple user…
Hiya - thanks for your advice - i tried that and doesn't show on mine; i've updated to 15.0.2 - - think it must depend on which carrier you use as mine is EE
Thanks for the challenge, Gavin.
From what I have noticed in looking this up, of course 5G and LTE are two technologies. If I am wrong , please someone jump on and set us straight.
5G always has a main tower and a neighbor cell tower, where possible, to jump to one another to keep the quality of the 5G signal strong and constant.
LTE has just a main tower and only looks for another tower when the main cell signal weakens or drops.
So, in the ios15 field test mode it looks like it is set up for 5G while still serving LTE, 4G,3G, etc, with the Neighbor tower being the main tower for LTE as it is always capturing the signal of the strongest tower.
Having said this the formula for RSRQ, I have found, is quite involved.
However, I found the following info that is self explanatory. Hope this helps…
RSRQ
Found this on a tech site…
Look at your RSRQ number in the field test, look at the corresponding negative number in the chart and you have your signal quality.
Unfortunately, I cannot put this chart up as it is supposed to be but, if you look down the list for the positive RSRQ number that is in your test mode and the negative numbers right below is the corresponding RSRQ number.
RSRQ
From
To
Unit
00
-19.5
dB
01
-19.5
-19.0
dB
02
-19.0
-18.5
dB
03
-18.5
-18.0
dB
04
-18.0
-17.5
dB
05
-17.5
-17.0
dB
06
-17.0
-16.5
dB
07
-16.5
-16.0
dB
08
-16.0
-15.5
dB
09
-15.5
-15.0
dB
10
-15.0
-14.5
dB
11
-14.5
-14.0
dB
12
-14.0
-13.5
dB
13
-13.5
-13.0
dB
14
-13.0
-12.5
dB
15
-12.5
-12.0
dB
16
-12.0
-11.5
dB
17
-11.5
-11.0
dB
18
-11.0
-10.5
dB
19
-10.5
-10.0
dB
20
-10.0
-9.5
dB
21
-9.5
-9.0
dB
22
-9.0
-8.5
dB
23
-8.5
-8.0
dB
24
-8.0
-7.5
dB
25
-7.5
-7.0
dB
26
-7.0
-6.5
dB
27
-6.5
-6.0
dB
28
-6.0
-5.5
dB
29
-5.5
-5.0
dB
30
-5.0
-4.5
dB
31
-4.5
-4.0
dB
32
-4.0
-3.5
dB
33
-3.5
-3.0
dB
34
-3.0
dB
____________
RSRQ
RSRQ
Signal quality
Description
>= -10 dB
Excellent
Strong signal with maximum data speeds
-10 dB to -15 dB
Good
Strong signal with good data speeds
-15 dB to -20 dB
Fair to poor
Reliable data speeds may be attained, but marginal data with drop-outs is possible. When this value gets close to -20, performance will drop drastically
<= -20 dB
No signal
Disconnection…
Sorry about the chart… Hope this helps.
Glenn
iphone 11/ios15 field test mode
