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

5 Aug 2020

      Hi Michael,
the antenna seems not to be active according to the wiring diagram and
some forum posts I found.
I double checked the connection of GPS and GSM. Seems to OK ...
Greetinx
Chris

Am Mittwoch, den 05.08.2020, 08:01 +0200 schrieb Michael Balzer:
...
    Chris,

    two additional thoughts:

    - maybe the VW antenna contains a GSM and a GPS antenna (?), and
you
    connected the wrong one?

    - maybe the VW antenna is an active one and needs a supply
voltage
    which is currently missing?

    Regards,
    Michael

    Am 05.08.20 um 07:24 schrieb Mark
      Webb-Johnson:

...

      Maybe,

      Or the VW antenna is way off on specification.

      Regards, Mark.

...
            On 5 Aug 2020, at 1:17 PM, Chris van der
              Meijden <chris@arachnon.de> wrote:

                Thank you for your response.

                That leaves me with a poor home made SMA
                  to Fakra adapter cable, I guess ...

                Regards

                Chris

                Am Mittwoch, den 05.08.2020, 09:27 +0800
                  schrieb Mark Webb-Johnson:

...
The antenna surely
                  helps, but in some locations you can receive
a signal
                  with a piece of wet string resting on the
antenna
                  connection. Seriously. At my office desktop,
I still
                  get 3G without an antenna connected (but I
don’t
                  recommend it due to possible feedback in the
modem
                  module).

                  These are not binary on/off situations.
                    An antenna rated to 1710-1990 will still
work at
                    1991, or even 2100, but just not optimally
with the
                    best reception or transmission.

                    The original Fasttech antennas were
                      designed for 2G (OVMS v2), but should
still cover
                      some 3G ranges optimally. The newer ones
(from
                      Medlock in USA and OpenEnergyMonitor in
UK) should
                      cover all ranges (up to and including 4G
LTE) -
                      and we used these for radio certification
so have
                      been very thoroughly tested at all the
supported
                      2G and 3G frequency ranges.

                    Regards, Mark.

...
                        On 5 Aug 2020, at 12:21 AM, Chris
                          van der Meijden <chris@arachnon.de>
                          wrote:

                            Still digging on the subject
                              ...

                            Today I took my original
                              Fasttech OVMS v2 antenna out of
my Nissan
                              Leaf and connected it to the
OVMS v3 in
                              our VW e-Up. And surprise,
surprise I got
                              direct connection over the SIM
to the
                              network.

                            The VW antenna gives me -101
                              dBm, the Fasttech antenna gives
me -91
                              dBm.

                            So I took a look at the
                              frequencies ...

                            The old fasttech antenna has a
                              frequency range of 824-960 /
1710-1990.

                            o2 (my SIM card provider) uses
                              GSM 900 and GSM+LTE 1800 for 2g
(4g LTE
                              cannot be used on the SIM5360)
and uses
                              UMTS 2100 for 3g.

                            Now I have two theories on
                              what make things go wrong with
the VW
                              antenna, but work with the
fasttech
                              antenna:

                            1. My home made sma / fakra
                              adapter cable to the VW antenna
is bad
                              (could be, but in the city it
connects)

                            2. Because 3g on 2100 mHz is
                              not available through the
fasttech
                              antenna, OVMS v3 is forced to
2g and
                              everything runs fine.

                            Any corrections on the second
                              theory are welcome. I'm
guessing ...

                            I will buy an other sma 2g/3g
                              antenna just to get rid of the
problem,
                              but will also continue thinking
on this
                              one.

                            Greetinx

                            Chris

                            Am Montag, den 03.08.2020,
                              12:31 +0200 schrieb Chris van
der Meijden:

...
                              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
> > >                                           850/900/180
> > > 0/1900MHz;
> > >                                       UMTS/HSPA+
> > >                                           900/2100MHz
> > >                                     
> > >                                     
> > > 
> > >                                     
> > >                                     There are SIMCOM
> > >                                       options/command
> > > s to restrict the
> > >                                       selection, but
> > > the default is
> > >                                       automatic.
> > >                                     
> > > 
> > >                                       Regards, Mark
> > >                                       
> > > 
> > >                                         
> > > >                                           On 2 Aug
> > > > 2020,
> > > >                                             at 6:40
> > > > PM, Chris van der
> > > >                                             Meijden
> > > > <chris@arachnon.de>
> > > >                                             wrote:
> > > >                                           
> > > >                                             
> > > >                                             
> > > >                                               Hey
> > > > Michael
> > > >                                               
> > > > 
> > > >                                               
> > > >                                               Thanx
> > > > for
> > > >                                                 the
> > > > help :-)
> > > >                                               
> > > > 
> > > >                                               
> > > >                                               The
> > > > AT
> > > >                                                 com
> > > > mands are working
> > > >                                                 now
> > > > , but as expected no
> > > >                                                 con
> > > > nection at all. So
> > > >                                                 als
> > > > o no fallback to 2g.
> > > >                                                 Or
> > > > no GPRS offered on 2g
> > > >                                                 ...
> > > >                                               
> > > > 
> > > >                                               
> > > >                                               Here
> > > > some
> > > >                                                 (Ge
> > > > rman) information on
> > > >                                                 the
> > > > "site lite"
> > > >                                                 tra
> > > > nsmitters:
> > > >                                               
> > > > 
> > > >                                               
> > > >                                               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
> > > >                                                 aro
> > > > und with the modem in
> > > >                                                 the
> > > > next days. Will also
> > > >                                                 try
> > > > congstar, I do have
> > > >                                                 a
> > > > congstar SIM laying
> > > >                                                 aro
> > > > und here ...
> > > >                                               
> > > > 
> > > >                                               
> > > >                                               Greet
> > > > inx
> > > >                                               
> > > > 
> > > >                                               
> > > >                                               Chris
> > > >                                               
> > > > 
> > > >                                               
> > > >                                               
> > > > 
> > > >                                               
> > > >                                               Am
> > > > Sonntag,
> > > >                                                 den
> > > > 02.08.2020, 10:59
> > > >                                                 +02
> > > > 00 schrieb Michael
> > > >                                                 Bal
> > > > zer:
> > > >                                               
> > > > >  Chris,
> > > > > 
> > > > >                                                 
> > > > > 
> > > > >                                                 h
> > > > > ow to send modem
> > > > >                                                 c
> > > > > ommands and read the
> > > > >                                                 r
> > > > > esponses:
> > > > > 
> > > > >                                                 
> > > > > 
> > > > >                                                 O
> > > > > VMS# log
> > > > >                                                  
> > > > >  level debug simcom
> > > > > 
> > > > >                                                 L
> > > > > ogging
> > > > >                                                  
> > > > >  level for simcom set
> > > > >                                                  
> > > > >  to debug
> > > > > 
> > > > >                                                 O
> > > > > VMS#
> > > > >                                                  
> > > > >  simcom cmd AT+COPS?
> > > > > 
> > > > >                                                 S
> > > > > IMCOM
> > > > >                                                  
> > > > >  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
> > > > > 
> > > > >                                                 
> > > > > 
> > > > >                                                 N
> > > > > ow let's see if we have
> > > > >                                                 3
> > > > > G:
> > > > > 
> > > > >                                                 
> > > > > 
> > > > >                                                 O
> > > > > VMS#
> > > > >                                                  
> > > > >  simcom cmd AT+CPSI?
> > > > > 
> > > > >                                                 S
> > > > > IMCOM
> > > > >                                                  
> > > > >  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
> > > > > 
> > > > >                                                 
> > > > > 
> > > > >                                                 Y
> > > > > es. Well, no surprise,
> > > > >                                                 T
> > > > > elekom network :-).
> > > > > 
> > > > >                                                 
> > > > > 
> > > > >                                                 T
> > > > > he SIM5360 is supposed
> > > > >                                                 t
> > > > > o automatically fall
> > > > >                                                 b
> > > > > ack to 2G if 3G isn't
> > > > >                                                 a
> > > > > vailable. On a quick
> > > > >                                                 b
> > > > > rowse through the
> > > > >                                                 m
> > > > > anual, I didn't find a
> > > > >                                                 c
> > > > > ommand to force 2G,
> > > > >                                                 j
> > > > > ust one to lock to a
> > > > >                                                 s
> > > > > pecific 2G cell… you
> > > > >                                                 c
> > > > > ould do that depending
> > > > >                                                 o
> > > > > n your location, but
> > > > >                                                 m
> > > > > aybe you should first
> > > > >                                                 i
> > > > > nspect your modem
> > > > >                                                 s
> > > > > tatus now.
> > > > > 
> > > > >                                                 
> > > > > 
> > > > >                                                 R
> > > > > egards,
> > > > > 
> > > > >                                                 M
> > > > > ichael
> > > > > 
> > > > >                                                 
> > > > > 
> > > > >                                                 
> > > > > 
> > > > >                                                 A
> > > > > m
> > > > >                                                  
> > > > >  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
> > > > > >                                                
> > > > > >    
> > > > > > 
> > > > > >                                                
> > > > > >    
> > > > > >                                                
> > > > > >    ____________________________________________
> > > > > > ___
> > > > > > OvmsDev mailing list
> > > > > > OvmsDev@lists.openvehicles.com
> > > > > > http://lists.openvehicles.com/mailman/listinfo/
> > > > > > ovmsdev
> > > > > > 
> > > > > >                                                
> > > > > >  
> > > > > 
> > > > >                                                 
> > > > > 
> > > > >                                                 _
> > > > > ______________________________________________
> > > > > OvmsDev mailing list
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> > > > > msdev
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> > > > >                                               
> > > > 
> > > >                                             
> > > > _______________________________________________
> > > > 
> > > >                                             OvmsDev
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> > > >                                             OvmsDev
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> > > >                                             http://
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> > > >                                           
> > > >                                         
> > > 
> > >                                       
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> > >                                     
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Re: [Ovmsdev] 3G / 2G fallback on SIM5360 Europe?

Chris van der Meijden