LTE Modem (Mikrotik), RRSI, RSRP etc..

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

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)

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.

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.

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.

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

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

(and I'm truncating one or more of them to zero decimal places)

That seems like a lot of effort, any reason you can't use winbox?

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)

ah that is pretty neat!

The speeds look good, but the latency is not so smart. Which mobile network is that?

Three. Latency isn�t as bad as it looks on those graphs, that is the latency reported by the Speedtest.net test, which is higher than the actual ping latency which is more like 30-40ms, which still isn�t great obviously.

so just for novice like me what should be SINR and RSRQ figures for working connection.

A table like this will help you gauge what sort of performance you might expect for different ranges.

https://www.digi.com/support/knowledge-base/understa...

excellent thanks. I get SINR of -20db with external mounted SXT, where as just 15 steps of my home, its +10. That explains the drop of speed from 90M to 30M