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AndrzejP78
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Posts: 1
Joined: Sun Oct 30, 2022 4:49 pm

Using cell lock on LHG LTE18

Sun Oct 30, 2022 5:37 pm

I recently purchased LHGGM&EG18-EA device and I do not know how to lock a cell on the device.
Procedure described in documentation https://wiki.mikrotik.com/wiki/Manual:I ... at_command does not work and I keep getting output: ERROR message in the terminal window.
Any idea which command can be executed to lock a cell on that device ?
 
fraxinus
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Joined: Thu Sep 08, 2022 9:09 pm

Re: Using cell lock on LHG LTE18

Thu Mar 02, 2023 10:50 pm

I searched for this, too.

Looks like the LTE18 modem is Quecktel EG18 and it has no such ability.

Source: the modem official AT command manual.
 
enselerizer
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Joined: Fri Jun 02, 2023 1:17 am

Re: Using cell lock on LHG LTE18

Fri Jun 02, 2023 1:58 am

There is a way to do a cell lock on EG18-EA modem, it worked for me on LHG LTE18 kit.

All information below is taken from this thread on the Quectel forum.

You will need to figure out PHY-CELLID (ID of the cell itself) and EARFCN (frequency that will be locked as primary band). You can get a list of cells around you and corresponding frequencies using cell monitor via web UI or console with:
interface/lte/cell-monitor lte1

You will get something like this:
PHY-CELLID  BAND  EARFCN  RSRP     RSRQ   RSSI    AGE
       247  B7      2850  -99dBm   -9dB   -68dBm  1s 
        99  B7      2850  -104dBm  -15dB  -79dBm  1s 
       258  B7      2850  -107dBm  -16dB  -83dBm  1s 
        69  B7      2850  -111dBm  -20dB  -79dBm  1s 
       362  B7      2850  -115dBm  -20dB  -85dBm  1s

Next, use the following command to set a cell lock:
interface/lte/at-chat lte1 input="at+qnwlock=\"common/4g\",1,2850,247"
where 247 is PHY-CELLID and 2850 is EARFCN.

Apparently you can set up to 20 cell locks and your modem will lock on the one with the best signal:
interface/lte/at-chat lte1 input="at+qnwlock=\"common/4g\",<NUMBER OF CELL LOCKS>,<EARFCN 1>,<PHY-CELLID 1>,<EARFCN 2>,<PHY-CELLID 2>, ..."

If you did something incorrectly or currently locked cell is not available anymore, use this to disable cell lock:
interface/lte/at-chat lte1 input="at+qnwlock=\"common/4g\",0"

If you want to see currently set cell lock, use the following command:
interface/lte/at-chat lte1 input="at+qnwlock=\"common/4g\""

Unfortunately, similar to R11e-LTE6 modem (LHG LTE6 kit), a cell lock will be reset after device reboot.

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