[Ovmsdev] 3G / 2G fallback on SIM5360 Europe?
Chris van der Meijden
chris at arachnon.de
Mon Aug 3 18:31:41 HKT 2020
Hi Michael
yeah, economical visionaries are always a lot of fun :-))
I read that "GSM voices services" line too and checked on that with my
mobile phone. I restricted the connection of the phone with
*#*#4636#*#* to "GSM auto (PRL)" and it connects to EDGE. So data over
GSM is available ...
Still mysterious. Will dig some more ...
Greetinx
Chris
Am Montag, den 03.08.2020, 12:21 +0200 schrieb Michael Balzer:
> Chris,
>
>
>
> we don't tell the modem to restrict itself in any way. Bugs in
> the
> modem firmware are likely, but I think a serious bug like this
> would
> have been solved early.
>
>
>
> I've read the pilot description now, and you need to pay
> attention
> to this section:
>
>
>
>
> > statt der üblichen drei Dienste LTE, UMTS
> > und GSM kommen in Kirchfarrnbach "nur" LTE 800 und LTE 900
> > für die
> > Datenversorgung sowie GSM für Sprachdienste und SMS zum
> > Einsatz.
> > Auf UMTS haben die Funknetzplaner hier verzichtet, weil
> > bereits
> > LTE und GSM alle Anforderungen der Bevölkerung erfüllen.
>
>
>
> …translated…
>
>
> > Instead of the usual three services LTE,
> > UMTS and GSM, "only" LTE 800 and LTE 900 are used in
> > Kirchfarrnbach for data supply as well as GSM for voice
> > services
> > and SMS. The radio network planners have dispensed with UMTS
> > here
> > because LTE and GSM already meet all the requirements of the
> > population.
>
>
>
> So you have neither UMTS nor EDGE. GSM is only available for
> voice
> streams and SMS. Data is only available via LTE.
>
>
>
> Your only option is to tell them they're a bunch of … outstanding
> economical visionaries, who could possibly consider rethinking
> their
> IoT compatibility ;-)
>
>
>
> Regards,
>
> Michael
>
>
>
>
>
> Am 03.08.20 um 11:33 schrieb Chris van
> der Meijden:
>
>
>
>
> >
> > 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
> > >
> > >
> > >
> > > > 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
> > > >
> > > >
> > > >
> > > > 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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