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 ĂĽblichen drei Dienste LTE, UMTS
und GSM kommen in Kirchfarrnbach "nur"
LTE 800 und LTE 900 fĂĽr die
Datenversorgung sowie GSM fĂĽr
Sprachdienste und SMS zum Einsatz. Auf
UMTS haben die Funknetzplaner hier
verzichtet, weil bereits LTE und GSM
alle Anforderungen der Bevölkerung
erfĂĽllen.
…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
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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