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Hugely fluctuating SINR

Cluckingdeath

Regular Member
Hi All,

I am getting large swings in my speed on EE and as far as I can tell it’s down to my SINR fluctuating.

ive got a Microtik SXT6 in the loft and it seemed to have been running pretty well, but I was just watching the LTE stats and within 1 min I saw it go from 1 to 13 and everything in between, not linear either, all over the shop

what would cause this on a static antenna?
 
SINR will fluctuate, so it's hard to tell if it's cause or effect. By its nature it's a metric that measures, unsurprisingly, the signal compared to the noise/interference.
For the signal part to be measured there has to be an ongoing transmission, when there is no signal, the noise/interference levels appear 'higher', pushing the SINR value lower.

That said, constant low SINR will cause speeds to be lower, but fluctuating values shouldn't (mostly)
 
Hmmm maybe it’s just contention I am seeing then or possibly an internal Wi-Fi issue. I’ll try plugging in directly and see if speeds are more stable
 
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This is what my home assistant logs as my SINR over 24hours.
Early hours of the morning being the time where there is the least noise and therefore the signal comes through more strongly which is shown as higher average SINR and less fluctuation. The rest of the day there is much more fluctuation.

7MKP
 
Hi All,

I am getting large swings in my speed on EE and as far as I can tell it’s down to my SINR fluctuating.

ive got a Microtik SXT6 in the loft and it seemed to have been running pretty well, but I was just watching the LTE stats and within 1 min I saw it go from 1 to 13 and everything in between, not linear either, all over the shop

what would cause this on a static antenna?
What do you mean by static antenna.
 
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Ok so I need to learn to KISS* sometimes.
Went in the loft (it’s a pretty major undertaking) to tweak it and the ***** thing was on the floor 🤦‍♂️
So much for it being a fixed antenna!
It’s definitely now a fixed antenna with the help of a few 4” screws.
Now running a silky smooth:


RSRP-78 dBm
RSRQ-10.5 dB
SINR18 dB

*Keep It Simple Stupid
 
Glad you got it sorted. Your metrics look excellent btw. Nothing wrong with your radio connection to the cell with those stats.
I just spent the last hour writing a lengthy reply, which I must admit began to digress quite a lot from the original topic, but was all relevant, but It will save for another post.
 
Glad you got it sorted. Your metrics look excellent btw. Nothing wrong with your radio connection to the cell with those stats.
I just spent the last hour writing a lengthy reply, which I must admit began to digress quite a lot from the original topic, but was all relevant, but It will save for another post.
Thank you Sir and my apologies for having wasted your time, although an educational post is never a waste of time!

Certainly a steep earning curve for me having had plug and play 70/18 fibre for the last 10 years or so, however it seems the Mikrotik is absolutely spot on for what I needed here in rural devon
 
Glad you got it sorted. Your metrics look excellent btw. Nothing wrong with your radio connection to the cell with those stats.
I just spent the last hour writing a lengthy reply, which I must admit began to digress quite a lot from the original topic, but was all relevant, but It will save for another post.

Will look forward to the digression Pwablo!

Glad you got your antenna sorted cluckingdeath, just need a carrier with a "more mature" back-haul and core than three and you'll be sorted!
 
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Will look forward to the digression Pwablo!

Glad you got your antenna sorted cluckingdeath, just need a carrier with a "more mature" back-haul and core than three and you'll be sorted!
I have no idea what that means 🤣
However we’re on EE and it all appears to be playing pretty well at the moment
 
Hi All,

I am getting large swings in my speed on EE and as far as I can tell it’s down to my SINR fluctuating.

ive got a Microtik SXT6 in the loft and it seemed to have been running pretty well, but I was just watching the LTE stats and within 1 min I saw it go from 1 to 13 and everything in between, not linear either, all over the shop

what would cause this on a static antenna?
Hi I recently installed the SXT LTE6 kit and have similar issues. The SINR fluctuates from around 11 - 18 dB and never stable, the kit is fixed to a pole so doesnt move. However my speed has dropped significantly from around 60-80mbs constant to 40mbs since mid December,

RSSI: -54 dMb
RSRP: -83 dMb
RSRQ: -7.0 dMb
SINR: 14 dMb
 
I'm posting on this post in the hope that @Pwablo will still have his saved reply from earlier that might help.

I have installed a https://www.amazon.it/gp/product/B08H7Y756H/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1, the SINR value is fluctuating hugely, I was trying to post a short video from HuaCtrl, showing the it going from -10, -13, -10, -9, -7, <-20, -9, -11, 10 in 14 seconds. The speeds are also totally varying, we got 35mbps when installing the other night it was 3mbps, this morning at 6:30 around 75mbps. We are able to get band 1, band 3 and band 20. I am currently testing it using a borrowed Huawei b525. I need to buy a router for there what would you recommend. Is there something that I'm doing wrong that the SINR is fluctuating so much?
 

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SINR, by its nature, always fluctuates - it needs to be transmitting something constantly for it to be measured (i.e. it needs a signal (the bit thats useful to you)).
When there is no (or less) signal being transmitted, the noise part of the equation will skew the ratio, and because you're capturing the value at a split instant you'll always get varying values.
What is more important really is the range of the values you get, particularly the minimum.

I posted this somewhere on here before, but here's my SINR over a 24hr period (captured every 5 mins I think).
7MKP


As you can see, the normal day-time variation is mostly between 10 (min) and 23 (ish), with the early hours of the morning (2-6) seeing a higher minimum, when there is less RF noise generally, skewing the ratio upwards.


Speeds are not necessarily impacted/restricted by low signal metrics - you should try capture the metrics when speeds are high and again when they are low (confirming you're connected to the same CellID at the same time, so that you're comparing like-for-like) - however given what you describe (peak-time slowdowns) it sounds more like general capacity issues on your mast than anything to do with the radio signal itself.
 
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This is what my home assistant logs as my SINR over 24hours.
Early hours of the morning being the time where there is the least noise and therefore the signal comes through more strongly which is shown as higher average SINR and less fluctuation. The rest of the day there is much more fluctuation.

7MKP
what app do you use to log that?
 
Thanks for your reply, maybe I was going about installing the antenna incorrectly, I was trying to adjust it based on it's SINR value. What is the best way to get the correct direction/position of the antenna?
 
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