I did some more reading on the SIM5360 and also digged a bit
through the simcom source. Found loads of AT-commands there :-)
I could not find an AT command to restrict the selection to
2g. Perhaps I did not look deep enough, but if someone knows the
command ...
I'm still thinking why the automatic fallback to 2g does not
happen.
- The transmitter offers only 2g (GSM 900 mHz) and LTE (800
or 1800). No 3g.
- I have a signal strength of -110 to -100 dBm
- AT+COPS? gives me an empty response.
Could it be possible, that somewhere in the code something
like
- I don't have 3g
- I do have LTE
- Lets try LTE
- I see LTE
- I have no hardware for LTE
- OK, don't do anything
happens? So somehow fallback to 2g never happens?
Just guessing around ...
Regards
Chris
Am Montag, den 03.08.2020, 10:10 +0800 schrieb 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
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:
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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