LHG lte6 dns/link issues

RouterOS Beginner Basics
1

Hi Mikrotik experts,
I seek you expertise. I have just bought lhg lte, using it with default configuration. Just added sim card, plugged it in and worked from the very first moment.
I have tried different aiming scenarios and I have obtained following link parameters :

RSSI -47 dBm
RSRP -77 dBm
RSRQ -8 dB
SINR 29 dB
CQI 15

Usually i get speeds btw 45-60 Mb/s up to 95 when cell is not loaded i guess.It works perfectly.. when it does..
Quite often I experience times when I cannot load any website and speed meter at that times shows 0.00Mb/s download (upload no affected it seems..)
At that time webpage loads very slowly and at the end i receive dns probe errors.

I quickly flicked through dns issues posted on forums but nothing appeals to me. I am noob in tes of mikrotik usage. Thats why I ask for you help.

2

Hi again,
I did some investigation and it seems that when I am using only single band (without CA) timeouts may still happen buts its like less than 0.5%. The second I turn on CA situation gets much worse. Periods with total 100% timeouts happen quite frequently.
My main connection is B7 and all signal parameters are posted above. Usually I select b3 for CA (signal quality is little worse but still within “good” range according to app graph).
Have any1 experienced such issues before? Is there anyway to debug it and check? I am kind of stressed that device i bought is broken :frowning:.


@Moderator could you please move the topic under wireless networking. I have just realized that its under wrong group :frowning:.
Need your help.

3

what if you un-tick B3 and use B7 only. top speed will be slower but hopefully less disconnection,.
there seems to be frequent speed drops and disconnection issues reported on the forum,

4

B7 alone works quite nicely. But you do not buy more expensive lte6 versions to stick to only 1 band :slight_smile:
I have also checked cat6 modem firmware:

installed: R11e-LTE6_V020
     latest: R11e-LTE6_V025

I will update it alter and recheck.

5

First please read the https://wiki.mikrotik.com/wiki/Manual:Interface/LTE, part of r11e-lte6 cell lock.

Upgrade to v25 can work.

Probably to “fix” ca you can type:
/interface lte at-chat lte1 input=“at*call=0”
and below 10s the ca assign, check this.

You should could force B3 or B7 by Frequency lock like
/interface lte at-chat lte1 input=“at*call=1,3,earfcn”
where earfcn is a number of one of your B3 or B7 band center of freq ± width
In this mode you can lock band, but not tower and you can hop to other tower and his cell.

To lock tower&cell you must add phy-cellid
/interface lte at-chat lte1 input=“at*call=2,3,earfcn,phy-cellid”

.
You should add logs:
system logging add topics=lte

Enable LteLogger: http://forum.mikrotik.com/t/sxt-lte-4g-cat6/134468/1

and then you can track all stuff in logs.

You can do even a graph of max speed DL&UL from 24h at testmy.net .

6

Thanks SiB!
It seems that firware upgrade alone solved the issue. Timeouts/packet loss still happen from time to time , but now connection is fully usable.
I have noticed that under Traffic tx/rx drops appear. Is this something to worry about?

7

I have got 0 here.

One suggestion. I have one user case where he have stable internet but all speedtest in DL are flapping from 20-60Mb and we do automatic test to see the progress in time.
his result:

solution: he call to his ISP and say he have not stable transfers and they “restart something” - and now he have the difference but in normal level like ±5-15Mb .
Maybe you call to ISP too.