[Ovmsdev] 3G / 2G fallback on SIM5360 Europe?

[Mark Webb-Johnson]

The SIM5360E should auto-switch between 2G and 3G. It supports the following frequency bands:

GSM/GPRS/EDGE 850/900/1800/1900MHz;
UMTS/HSPA+ 900/2100MHz

There are SIMCOM options/commands to restrict the selection, but the default is automatic.

Regards, Mark

> On 2 Aug 2020, at 6:40 PM, Chris van der Meijden <chris at arachnon.de> wrote:
> 
> Hey Michael
> 
> Thanx for the help :-)
> 
> The AT commands are working now, but as expected no connection at all. So also no fallback to 2g. Or no GPRS offered on 2g ...
> 
> Here some (German) information on the "site lite" transmitters:
> 
> https://www.telekom.com/de/blog/netz/artikel/standort-light-pilotprojekt-552152 <https://www.telekom.com/de/blog/netz/artikel/standort-light-pilotprojekt-552152>
> 
> I also did not find any AT command for the SIM5360 to force 2g. I will play a bit around with the modem in the next days. Will also try congstar, I do have a congstar SIM laying around here ...
> 
> Greetinx
> 
> Chris
> 
> 
> Am Sonntag, den 02.08.2020, 10:59 +0200 schrieb Michael Balzer:
>> Chris,
>> 
>> how to send modem commands and read the responses:
>> 
>> OVMS# log level debug simcom
>> Logging level for simcom set to debug
>> OVMS# simcom cmd AT+COPS?
>> SIMCOM command has been sent.
>> D (164488782) simcom: tx mcmd ch=4 len=10  : AT+COPS?
>> D (164488792) simcom: rx line ch=4 len=23  : +COPS: 0,0,"congstar",2
>> D (164488802) simcom: rx line ch=4 len=2   : OK
>> 
>> Now let's see if we have 3G:
>> 
>> OVMS# simcom cmd AT+CPSI?
>> SIMCOM command has been sent.
>> D (164693462) simcom: tx mcmd ch=4 len=10  : AT+CPSI?
>> D (164693482) simcom: rx line ch=4 len=85  : +CPSI: WCDMA,Online,262-01,0x16C3,7824927,WCDMA IMT 2000,454,10836,0,7.5,104,18,8,500
>> D (164693482) simcom: rx line ch=4 len=2   : OK
>> 
>> Yes. Well, no surprise, Telekom network :-).
>> 
>> The SIM5360 is supposed to automatically fall back to 2G if 3G isn't available. On a quick browse through the manual, I didn't find a command to force 2G, just one to lock to a specific 2G cell… you could do that depending on your location, but maybe you should first inspect your modem status now.
>> 
>> Regards,
>> Michael
>> 
>> 
>> Am 02.08.20 um 09:39 schrieb Chris van der Meijden:
>>> Hi all
>>> 
>>> I'm trying to understand some principals of the SIM connection methods of OVMS.
>>> 
>>> Reason is that I recently moved from "the big city" Munich to the very much rural village Thalham. In Thalham we have so called "lite" mobile transmitters. These transmitters are installed, as far as I understood, to safe money and to prepare the transition of the providers to 4g / 5g. They are forcing the frequencies towards the 4g band with those.
>>> 
>>> So these transmitters seem to offer only 2g and 4g, but no more 3g (really ???).
>>> 
>>> I don't have any network connection with the SIM in my OVMS here in Thalham. In the next village Zolling I have connection. In Zolling they don't have the "lite" transmitters, but still have full 3g support. The antenna of my OVMS is working well (-100 dBm to -70 dBm).
>>> 
>>> Now my questions ...
>>> 
>>> Does OVMS have a fallback on SIM5360 Europe to 2g (EDGE) if 3g is not available?
>>> 
>>> I also did some reading in the modem documentation and tried to send some AT commands. Goal is to try to force the SIM into 2g mode. I tried i.e.
>>> 
>>> simcom muxtx 2 AT+COPS?
>>> 
>>> to get some information from the SIM, but I don't get an answer on that command at all. No matter what channel I try. Am I missing something there?
>>> 
>>> Thanx for input.
>>> 
>>> Regards
>>> 
>>> Chris
>>> 
>>> 
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