LTE Signal - What is considered normal
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- #1
Sat Aug 05, 2023 11:35 pm
Hi guys!
I'm trying to diagnose connection/speed issues with my LTE modem whether it is provider limitation or bad signal. Can anyone tell me what is likely looking at this screenshot?
RSRP is relatively static - between 89 to 91, rarely changing.
RSRQ is static.
SINR is changing rapidly - between 0 to 10
thanks
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Re: LTE Signal - What is considered normal
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- #2
Tue Aug 08, 2023 10:55 pm
RSRP higher than -100dBm is decent, RSRP higher than -85dBm is pretty good, RSRP higher than -70dBm is excellent and RSRP higher than -50dBm is excessive (and might overwhelm receiver).
RSRQ below -8dB is bad, anything between -5dB and -8dB is good and above -5dB is great.
SINR calculation likely includes user data (RSRQ only includes reference symbols, broadcast by cell) and is thus affected by availability and amount of user data. So it's not entirely unexpected to se it jumping up and down.
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Re: LTE Signal - What is considered normal
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- #3
Tue Aug 08, 2023 11:27 pm
If you run the Dude server, one thing that is helpful is to track these over time. Sometimes with only a few datapoints are tough to get full picture of what's going on, especially since it might change bands etc. between views. If helpful, I wrote up how to setup using a probe to do this: viewtopic.php?t=192103&hilit=dude+lte
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Re: LTE Signal - What is considered normal
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- #4
Wed Aug 09, 2023 1:09 am
The signal strength/quality is important but also important is how much overloaded is the tower that you are connecting. Sadly this last you can't see it.
Normally at 3-4 AM on week days you can discard this and evaluate the relationship between both things.
Regards.
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Re: LTE Signal - What is considered normal
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- #5
Wed Aug 09, 2023 1:15 am
Well, channel bandwidth (e.g. 20/10/5 Mhz) is sometimes telling of various congestion. e.g. If you normally see 20Mhz, but then it's 10Mhz channel, and device is not moving...
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Re: LTE Signal - What is considered normal
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- #6
Wed Aug 09, 2023 8:10 am
I have found that looking at SINR usually gives the best indication of overall situation. 4 is quite low, but workable. Try to get it higher
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Re: LTE Signal - What is considered normal
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- #7
Wed Aug 09, 2023 1:58 pm
And CQI as indicator? 8 is somewhat the lowest I find for a usable connection. It goes up to 15 (= max, excellent).
See exemple viewtopic.php?t=197753#p1016143
Cell 134040591 is strong (even strongest) -79dB RSRP, SINR is even 12 dB , still a very bad connection in practice. A see a good correlation with CQI, for qualifying a cell.
The tower RRM sent me to this cell all that time. (Had to mask that band B20, so the tower will not direct the UE to that band anymore)
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