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rafmik
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Joined: Sun Jul 24, 2022 10:32 pm

RBLDFR&R11e-LTE6 - problem with Carrier Aggregation B3 (as primary band) and B20 (CA Band)

Sun Jul 24, 2022 10:51 pm

Hello
I'm using Mikrotik RBLDFR&R11e-LTE6 as my LTE modem.

BTS which I have my signal from supports B3 and B20 band.

My modem in CA mode always set B20 as a primary band, and B3 as secondary:


Image


It is resulting in that I have aggregated download speed (B3+B20), but upload is working on B20 (slow):

Image


When I turn off CA, and set only B3 band (so it is primary) my upload speed is x3 times better then on B20:

Image


What I would like to do:

- Set B3 as a primary band
- Set B20 as a CA band (secondary)



What I do for now:


Type in terminal:
/interface lte at-chat lte1 input="AT*Cell=2,3,,1474,136"
And get reponse:

[rafal@MikroTik] > /interface lte at-chat lte1 input="AT*Cell=2,3,,1474,136"
  output: +CGEV: NW PDN DEACT 5
  
  

That makes B3 as primary band, but B20 won't connect as a CA band (secondary):

Image

 
Image



What can I do, to set B3 as primary, and B20 as secondery?



I tried to update:
RouterOS from 6.49.6 to 7.4
modem firmware from V025 to V033

It did not help :(
 
hecatae
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Joined: Thu May 21, 2020 2:34 pm

Re: RBLDFR&R11e-LTE6 - problem with Carrier Aggregation B3 (as primary band) and B20 (CA Band)

Wed Jul 27, 2022 12:50 pm

Can you connect to B3+B3?
 
rafmik
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Topic Author
Posts: 2
Joined: Sun Jul 24, 2022 10:32 pm

Re: RBLDFR&R11e-LTE6 - problem with Carrier Aggregation B3 (as primary band) and B20 (CA Band)

Thu Jul 28, 2022 11:28 pm

Can you connect to B3+B3?


Yes, when I cancel cell lock and turn on only B3 mode.
 
zhka
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Joined: Thu Sep 15, 2022 12:42 am

Re: RBLDFR&R11e-LTE6 - problem with Carrier Aggregation B3 (as primary band) and B20 (CA Band)

Wed Oct 05, 2022 6:33 pm

Same here.
There are wap R with R11e-LTE6 and external antenna.
In automatic mode modem works with aggregation - B20@cell-id 5 as Primary + B3@cell-id 420 as CA.
But sometime it connects to another cell B20@cell-id 196 and no CA bands available with it..
I tried to lock modem to cell 5 or 420, but then modem works only with that locked band (can't find CA or just not searching).
Guy from support said that problem on operator's side, but as I see it's not.
Did you found an solution?

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