Fix a gsm modem to a particular cell tower

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Ramón
New member
Username: El_miche

Post Number: 21
Registered: 02-2008
Posted on Thursday, June 30, 2016 - 09:28 pm:   

Hi, Des.

Do you know if is posible fix connection between a GSM and a particular Cell? For example:

- in a place are coverage of two cell towers of same operator (cell A, and cell B).
- wen gsm modem star up, this take signal an register on a Cell A. Always, automaticaly register on a Cell A.
- Is posible set manualy LAC ID and CID (or another parameter) for the modem register always on a cell B?

Regards.
Des - NowSMS Support
Board Administrator
Username: Desosms

Post Number: 5687
Registered: 08-2008
Posted on Tuesday, July 05, 2016 - 07:55 pm:   

Hi Ramón,

As part of the ETSi/3GPP standard commands, no.

However, some modules do have extended commands. For example, Wavecom modem chipsets have commands defined to lock the modem to a specific cell tower frequency.

AT+CCELL=xx tells the modem to connect to the cell tower at frequency xx.


The AT+CCED=0,3 command can be used to query available cells.

The docs give the following example response:

+CCED:208,20,0002,0418,37,706,24,,,0 ,,,0,208,20,0006,989b,37,835,20,208,2 0,0002,02a9,37,831,12,208,20,0101,79 66,34,818,13,208,20,0006,9899,39,713 ,9,208,20,0002,0a72,33,711,12,208,20, 0101,03fb,36,824,10,1
OK


The response contains info on the current connected (main) cell and up to 6 neighbor cells.

The main cell has 13 parameters, and the neighbors have 7 parameters.

The cell frequency is the 6th parameter for each cell.

Looking at the example...I've bolded the cell frequency.

Main: 208,20,0002,0418,37,706,24,,,0 ,,,0
Neighbor 1: 208,20,0006,989b,37,835,20
Neighbor 2: 208,2 0,0002,02a9,37,831,12
Neighbor 3: 208,20,0101,79 66,34,818,13
Neighbor 4: 208,20,0006,9899,39,713 ,9
Neighbor 5: 208,20,0002,0a72,33,711,12
Neighbor 6: 208,20, 0101,03fb,36,824,10,1

--
Des
NowSMS Support
Ramón
New member
Username: El_miche

Post Number: 22
Registered: 02-2008
Posted on Tuesday, July 05, 2016 - 09:27 pm:   

Thanks dess, i will try if my modem support this commands.
So, for example:
If i want to connect to Neighbor 3, just input AT+CCELL=818 command. Is this right?
what happens if the modesm restart? Is needed insert the comman again?

Regards and thanks so much.
Ramón
New member
Username: El_miche

Post Number: 23
Registered: 02-2008
Posted on Tuesday, July 05, 2016 - 09:55 pm:   

Hi, again.

i was just try and my modem support +ccell command. But I have a question (in addition to the above). for example:

- I set AT+CCELL=818
- modem response +ccell 818,xx

But later I have a lot of same response. just they appear
+ccell 818,xx
+ccell 818,xx
+ccell 818,xx
+ccell 818,xx
+ccell 818,xx
+ccell 818,xx
+ccell 818,xx

...all time.
Des - NowSMS Support
Board Administrator
Username: Desosms

Post Number: 5688
Registered: 08-2008
Posted on Wednesday, July 06, 2016 - 01:28 pm:   

Hi Ramón,

I have limited experience with these commands, but I do believe the setting needs to be re-applied after a restart (and possibly also if the application closes/reopens the modem connection).

If using NowSMS, I would add CommandPostInit1=AT+CCELL=818 to the appropriate modem section in SMSGW.INI.

What value are you seeing for xx? 0 is OK...3 means connection lost.

Some more info here: http://archive.sierrawireless.com/Download.aspx?File=%5CAirPrime%5CM1206-M1306-M 2106%5CApplication_Notes%5CCell_Lock%20v3.pdf

--
Des
NowSMS Support
Ramón
New member
Username: El_miche

Post Number: 24
Registered: 02-2008
Posted on Wednesday, July 06, 2016 - 08:04 pm:   

Thanks, Des!

I'll do some testing.

xx value was 4.. so, i thintk that this a network operator problem.

thanks for provide this PDF.

Kind Regards!

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