Chateau LTE12 starts with 3CA but becomes 2CA after a while

RouterOS RouterOS beta
1

I noticed this recurring issue - running 7.0beta8 and modem firmware EG12EAPAR01A06M4G.
When LTE connection is set up, I initially see that the router aggregates 3 bands across the available ones : B1,B3,B7
After some time it goes into 2CA mode and it never reverts back to 3CA unless I close and reopen the LTE connection (disable/enable).

Is this a known issue? I understand that B7 is very weak signal, but when it uses it, it actually works fine and gives me 20 mbit/s more…

Thanks
Rick

primary-band: B1@10Mhz earfcn: 150 phy-cellid: 81
            ca-band: B3@20Mhz earfcn: 1650 phy-cellid: 81


Columns: PHY-CELLID, BAND, EARFCN, RSRP, RSRQ, RSSI, AGE
  PHY  BA  EARF  RSRP     RSRQ   RSSI    AG
   81  B1   150  -95dBm   -9dB   -69dBm  2s
   81  B3  1650  -94dBm   -12dB  -72dBm  2s
  273  B7  3350  -117dBm  -15dB  -93dBm  2s
  280  B7  3350  -111dBm  -11dB  -91dBm  2s
  399  B1   150  -106dBm  -20dB  -72dBm  2s
  399  B3  1650  -104dBm  -19dB  -75dBm  2s
  400  B1   150  -104dBm  -12dB  -83dBm  5s
  400  B3  1650  -100dBm  -15dB  -75dBm  2s
2

After a disable/enable:

       primary-band: B1@10Mhz earfcn: 150 phy-cellid: 81
            ca-band: B7@20Mhz earfcn: 3350 phy-cellid: 280,B3@20Mhz earfcn: 1650 phy-cellid: 81
3

I fixed this by locking B7 (the weakest band) as primary, this way it works as I would like it to :slight_smile:

4

I always have three bands in CA (very good signal).

In your case, it simply disconnect poor connection but you can lock in bands you want as you already did.

5

Unfortunately it seems I can only lock primary band. I wish I could also lock the CA ones.

6

Try cell lock but guys say CA is automatically determined by cell tower.

http://forum.mikrotik.com/t/chateau-lte12-and-r11e-lte6-passthrough/138488/1

7

That’s true, but I would like to be able to tell the modem to prefer B3 to B1 for CA, for example…

8

I have sent a command for locking primary & CA. It seems to work. You have to try, it is all down to ISP.

I have an issue with two cell towers 2km apart and my modem often use the wrong/weak one.

9

what command would that be? the only command I know only locks primary band (yes you can specify more than one cell but it’s for the purpose of primary band still . it uses best one from the list)

10

already linked, check out post #6 :wink:

11

That command only locks primary band (one or more cells can be specified but these are all primaries)