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Standard User _Belial
(member) Sat 29-Feb-20 18:00:26
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LTE Modem (Mikrotik), RRSI, RSRP etc..


[link to this post]
 
Hi All,

Just installed a mikrotik UHG LTE and all works fine, but one thing I'm confused by is what these values mean?

rssi (-59 dBm)
rsrp (-88 dBm)
rsrq (-7.0 dB)
sinr (22dB) (I assume it's Signal to Noise Ratio?)
cqi (6)

Ideall if i'm tweaking hte position of the antena, which way should I look for the values to go and which value is most important?

Thanks in advance

_________________________________
cba changing my sig every time

if (isp.name='Nildram') { speed-=50%}
Standard User andynormancx
(member) Mon 02-Mar-20 11:02:45
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Re: LTE Modem (Mikrotik), RRSI, RSRP etc..


[re: _Belial] [link to this post]
 
Yes, SINR is signal to noise ratio.

The other important one is RSRQ which is the quality of the signal received (once it has been extracted from all the other noise).

Your RSRQ and SINR values are pretty good already.

This is the most comprehensive write up of what the different measurements represent, but I can't claim to understand all of it.

https://www.cablefree.net/wirelesstechnology/4glte/r...

Edited by andynormancx (Mon 02-Mar-20 11:05:34)

Standard User sheephouse
(member) Mon 02-Mar-20 15:16:22
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Re: LTE Modem (Mikrotik), RRSI, RSRP etc..


[re: _Belial] [link to this post]
 
I have a Mikrotik SXT LTE Kit, and the one statistic I take most notice of is CQI - the higher the better. It has a direct correspondence with throughput as the value affects the modulation scheme used. I have a CQI of 15, which is the maximum. If you can get yours up to 7 you may notice a step change in speed as the modulation changes.


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Standard User _Belial
(member) Mon 02-Mar-20 15:18:22
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Re: LTE Modem (Mikrotik), RRSI, RSRP etc..


[re: sheephouse] [link to this post]
 
Thank you both for your replies.

I'll have a tinker with the position then to se what I can get the CQI up to and cross my fingers for higher throughput.

_________________________________
cba changing my sig every time

if (isp.name='Nildram') { speed-=50%}
Standard User andynormancx
(member) Mon 02-Mar-20 15:26:05
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Re: LTE Modem (Mikrotik), RRSI, RSRP etc..


[re: sheephouse] [link to this post]
 
Interesting, I'd not really come across CQI before. My SINR hovers around 20 dB, but my CQI seems to be hovering around 14-15.

I'll have to see if I can capture my CQI in my monitoring.
Standard User andynormancx
(member) Mon 02-Mar-20 16:22:53
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Re: LTE Modem (Mikrotik), RRSI, RSRP etc..


[re: andynormancx] [link to this post]
 
Annoyingly it seems the CQI isn't available over SNMP on the Mikrotik. I already manage to fetch RSRP and SINR, but the number of parameters

RSRP:
snmpget -v2c -c public 192.168.7.2 .1.3.6.1.4.1.14988.1.1.16.1.1.4.1

SINR:
snmpget -v2c -c public 192.168.7.2 .1.3.6.1.4.1.14988.1.1.16.1.1.7.1
Standard User andynormancx
(member) Mon 02-Mar-20 20:39:38
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Re: LTE Modem (Mikrotik), RRSI, RSRP etc..


[re: andynormancx] [link to this post]
 
Couldn't get what I wanted from snmp, had to resort to ssh and data mangling in sed:

DOWNLOAD=`echo '/interface lte info lte1 once' | ssh [email protected] -T|grep rsrp|sed 's/.* -\([0-9]\+\).*/\1/'`
UPLOAD=`echo '/interface lte info lte1 once' | ssh [email protected] -T|grep sinr|sed 's/.* \([0-9]\+\).*/\1/';`
RSRQ=`echo '/interface lte info lte1 once' | ssh [email protected] -T|grep rsrq|sed 's/.* -\([0-9]\+\).*/\1/'`
CQI=`echo '/interface lte info lte1 once' | ssh [email protected] -T|grep cqi|sed 's/.* \([0-9]\+\).*/\1/';`

And yes, I know I could avoid connecting to the router four times if I could be bothered wink

(and I'm truncating one or more of them to zero decimal places)
Standard User _Belial
(member) Tue 03-Mar-20 16:23:34
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Re: LTE Modem (Mikrotik), RRSI, RSRP etc..


[re: andynormancx] [link to this post]
 
That seems like a lot of effort, any reason you can't use winbox?

_________________________________
cba changing my sig every time

if (isp.name='Nildram') { speed-=50%}
Standard User andynormancx
(member) Tue 03-Mar-20 16:41:32
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Re: LTE Modem (Mikrotik), RRSI, RSRP etc..


[re: _Belial] [link to this post]
 
Winbox won't give me a history of my LTE stats, download/upload speeds and ping times.

All of which lets me keep track of how well my LTE connection is working.

https://toop.microsign.co.uk/fud/lte/wan-day.html

(still need to get the CQI working)
Standard User _Belial
(member) Tue 03-Mar-20 16:45:03
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Re: LTE Modem (Mikrotik), RRSI, RSRP etc..


[re: andynormancx] [link to this post]
 
ah that is pretty neat!

_________________________________
cba changing my sig every time

if (isp.name='Nildram') { speed-=50%}
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