Yes, the car wakes up briefly about every 4 hours and connects to the network via WiFi or cell phone, but then goes back to sleep mode. In order to keep the car permanently connected to the WLAN, Sentry Mode must be active and with it practically all of the car’s electronics. In sleep mode it somehow still maintains a connection via LTE and is woken up via SMS or something similar, which takes about 20 seconds. The car can then be controlled via the app. A persistent WLAN connection is not provided in sleep mode.
@GrandDixence Thank you very much for the detailed answer. I’ll read through the linked articles at my leisure.
I have a Raspberry at home and know a bit about it. 🙂
I would be happy to get back to you with any further questions once I have researched everything.
but another question; Wouldn’t it be possible to tap into the existing 4G antenna on the house facade, which distributes mobile communications via a WiFi repeater in the underground car park, i.e. bring it into the garage with a passive antenna?
Of course, you can “put together” a passive mobile phone repeater for the underground car park using the existing 4G antenna. The only question is whether the cell phone signal received by the cars via passive cell phone repeaters is strong enough. That’s why you have to do some calculations beforehand, as described in article no. 22 under:
[https://community.swisscom.ch/t5/Archiv-telefonie/Passive-Signalumlenkung/m-p/668182#M61945](https://community.swisscom.ch/t5/Archiv-telefonie/Passive-Signalumlenkung/m-p/ 668182#M61945)
has been described in detail.
11 days later
Hi GrandDixence First of all, a big thank you for the detailed description and the links to all pages.
It took me a while but I finally found time to read the whole thing in peace.
The solution with a private campus network seems to me to be the simplest. The costs for the hardware are certainly affordable. But if I understand this correctly, everything depends on the BAKOM license.
I also read through the Bakom license and was a bit shocked by the costs. The processing fees etc would still be affordable because they would be one-off costs. But as I understand it, the annual costs for the desired bandwidth can quickly shoot up because 1Mhz is charged at CHF 48 per year (min. 5 year contract). At 10Mhz that would be CHF 480 per year for wanting to preheat your car with the app. 🙂 And, I wouldn’t even know off the top of my head whether the 10Mhz bandwidth would be enough for our underground car park/area.
Or am I misunderstanding the calculation?
Here is an excerpt from the OFCOM guidelines and the link:
[https://www.bakom.admin.ch/dam/bakom/de/documents/Infomailing/nutzsbedingung-campusnetze.pdf.download.pdf/Nutzungsconditions%20für%20Campusnetze%20in%20der%20Schweiz.pdf] (https://www.bakom.admin.ch/dam/bakom/de/documents/Infomailing/nutzsbedingung-campusnetze.pdf.download.pdf/Nutzungsconditions%20für%20Campusnetze%20in%20der%20Schweiz.pdf)
Has the “official” route already been tried?
[https://www.swisscom.ch/de/business/enterprise/angebot/enterprise-mobile/inhouse-mobile-services.html#tab=Inhouse](https://www.swisscom.ch/de/business/ enterprise/offer/enterprise-mobile/inhouse-mobile-services.html#tab=Inhouse)
There are different sized solutions, I think it should be possible.
Especially when it affects multiple parties.
Under no circumstances should you use any funny internet femto cells or mobile repeaters.
If it leads to errors and the whole thing is discovered OFCOM is very sensitive.
Ich bin ein als Privatkunde getarnter Swisscom-Mitarbeiter im Bereich Service Continuity.
It was mentioned above that there is no WiFi in the cars, only mobile communications?
Then your link would be the optimal solution.
However, the electric cars cannot access WiFi because the electric cars do not have a WiFi module installed (brands: Genesis GV70, Mercedes EQC, VW Tiguan). The cars only have a GSM module (hope that’s the right term), meaning they can only access the Internet via a mobile phone network.
Installationen, Netzwerk, Internet, Computertechnik, OS Windows, Apple und Linux.
Ich bin ein als Privatkunde getarnter Swisscom-Mitarbeiter im Bereich Service Continuity.
@Dolce83 wrote:
And, off the top of my head, I wouldn’t even know whether the 10Mhz bandwidth would be enough for our underground car park/area.
Due to a lack of computing power, the Raspberry Pi 4 only supports a maximum bandwidth of 5 MHz. Quote:
« Limited cell bandwidth (currently 5 MHz) »
Source:
[https://docs.srsran.com/projects/4g/en/latest/app\_notes/source/hw\_packs/source/index.html#package-1](https://docs.srsran.com/ projects/4g/en/latest/app_notes/source/hw_packs/source/index.html#package-1)
The maximum data transfer rates that can be achieved with a 5 MHz bandwidth can be calculated here:
https://www.cellmapper.net/4G-speed
\=> Bandwidth: 5 MHz (25 resource blocks)
\=> Downlink modulation: 64 QAM (realistic with good reception)
\=> Uplink modulation: 16 QA (realistic with good reception)
\=> MIMO 1×1 SiSO (only 1x transmit antenna and 1x receive antenna)
Whether that’s enough for the vehicle fleet needs to be tested. I guess: Yes, it’s enough.
The Raspberry Pi 5 has significantly more computing power than the Raspberry Pi 4. More computing power = more bandwidth in mobile communications. With the “EDATEC Raspberry Pi 5” housing, the Raspberry Pi 5 should be properly passively cooled. I can only advise against active cooling with a fan.
[https://www.martinrowan.co.uk/2024/02/edatec-raspberry-pi-5-fanless-enclosures/](https://www.martinrowan.co.uk/2024/02/edatec-raspberry -pi-5-fanless-enclosures/)
@GrandDixence You’re a genius! 🙂 Great thanks again for the explanation.
Out of interest, have you ever implemented something like this for yourself/your settlement? You seem to have a lot of know-how. 🙂
In any case, I will give feedback here on what Swisscom will say about my request.
Wish everyone a happy Easter.
No, I haven’t realized it (yet). Is an ongoing craft project of mine:
- Own mobile network with srsRAN_4G and LimeSDR-Mini on a Raspberry Pi 4 with Ubuntu 20.04 LTS
Due to a lack of rain and (free) time, this craft project is not progressing.
For this craft project, I holed up in the well-shielded civil defense cellar for testing purposes. And use the unassigned (green) frequency band in mobile radio frequency band 7.
Downlink: 2685 to 2690 MHz
Uplink: 2565 to 2570 MHz
[https://de.wikipedia.org/wiki/Mobilfunkfrequencies\_in\_der\_Switzerland#2.6\_GHz\_[Band_7](https://de.wikipedia.org/wiki/Mobilfunkfrequencies_in_der_Schweiz#2 ,6_GHz_[Band_7)]
Thanks to the thick walls and the low transmission power of the LimeSDR-Mini (maximum 13.5 dBm):
https://wiki.batc.org.uk/LimeSDR_Mini_Output_Power_Levels
13.5 dBm = 22.4 mW (milliwatts)
It is highly unlikely that I will disrupt any radio application with this craft project.
@GrandDixence Very interesting, I would be happy about a little report
I’ve been fascinated by “building” my own mobile phone network for a long time, but never really had the time to delve further into it
My craft project “Own mobile network with srsRAN_4G and LimeSDR-Mini” has come to an abrupt stop. The LimeSDR Mini emits a decent 4G/LTE cellular signal at the upper end of Band 7:
The “manual mobile network search” from the (older) smartphone finds its own mobile network as “22899”:
But logging into this mobile network doesn’t work because I can’t find a way to allow all SIM cards in circulation to log into your own mobile network in the core network (EPC).
The srsEPC program only allows the registration of SIM cards whose data is stored in the user database (srsEPC: user_db.csv). Self-issued SIM cards are required to store the SIM card data. SIM cards suitable for this purpose are available from Sysmocom, for example:
https://www.sysmocom.de/products/sim/
The srsEPC program is part of the open source product srsRAN and provides the core network (EPC) of a 4G/LTE mobile network. Other open source products for operating a core network (EPC) of a 4G/LTE cellular network suffer from the same SIM card problem. For example Open5GS:
https://github.com/open5gs/open5gs/issues/611
My instructions for the craft project:
- Own 4G/LTE mobile network with srsRAN_4G and LimeSDR-Mini on a Raspberry Pi 4 with Ubuntu 20.04 LTS
can be found at:
My instructions for the craft project:
- Own 2G/GSM mobile network with OsmoCOM and LimeSDR-Mini on a Raspberry Pi 4 with Ubuntu 20.04 LTS
can be found at:
Maybe these instructions will help someone…
Hello everyone, I just received a call from Swisscom in response to my request, which I started with Swisscom via here:
[https://www.swisscom.ch/de/business/enterprise/angebot/enterprise-mobile/inhouse-mobile-services.htm…](https://www.swisscom.ch/de/business/enterprise /angebot/enterprise-mobile/inhouse-mobile-services.html#tab=Inhouse)
I spoke to a Mr. Heaven (I hope I got the name right) on the phone and explained to him my concern as described here in my very first post. He said that there is certainly a solution, but it would be expensive, i.e. it would cost several thousand francs if not ten thousand francs.
However, he pointed me to the website https://www.myamplifiers.com/ which he had already recommended to other customers and this solution would have worked. This is a signal amplifier for 4G/5G/LTE.
When I pointed out that active signal amplifiers were apparently not legal, which was already mentioned in this article, he said that it was the case with such small areas as e.g. Our underground car park of around 200m2 would be fine and will not be a problem.
As I said, the gentleman was from Swisscom itself.
I then inquired on the website https://www.myamplifiers.com/ and spoke to customer service. And I was offered this solution for our development: https://www.myamplifiers.com/de/repeater-257/.
There is no assembly service, meaning you have to install the whole thing yourself. But all you have to do is assemble it, switch it on and you’re done. It doesn’t require an additional mobile phone contract or a SIM; it pulls the existing signal from outside into the garage and distributes it via the indoor antenna.
What do you think about that? Are there any experiences?
I’m also surprised that this was recommended by Swisscom
@Dolce83
This repeater amplifies signals from all providers. Accordingly, you need permission from all providers.
And for the sake of completeness, it should be mentioned that the responsibility ultimately lies with you. If disruptions occur, you are liable.
The declarations of conformity are missing on the Myamplifiers site, perhaps I overlooked that (CE is not enough).
Installationen, Netzwerk, Internet, Computertechnik, OS Windows, Apple und Linux.
@WalterB
The site is quite dubious, I doubt that it was created with the consent of the operators.
There are also providers listed that do not have their own network.
The business address is just a trading company with its headquarters in Gibraltar and a mailbox in Munich (86 companies in a small building)
There are also the legal problems that I mentioned. Lack of declaration of conformity and the fact that you need permission from all providers.
“If you import a mobile radio repeater from abroad, you are responsible for its conformity; importing non-conforming radio equipment is a punishable offense.”
[https://www.bakom.admin.ch/bakom/de/home/geraete-anlagen/besondere-geraete/mobilfunk-verstaerker.html](https://www.bakom.admin.ch/bakom/de/ home/devices-systems/special-devices/mobile-radio-amplifiers.html)