Hello @Mikael-Guenais,
NB-IoT roaming is available in France via SFR. You can also always find up-to-date information on our roaming partners in our documentation library here.

I will contact you about the SIM card directly from our support email.

Best regards
Oliver

@Herr-Bruns

Feature deployment is in preparation, please bear with us a little longer… 🙏

Kind regards, Ronan

I second what Uta said for roaming use-cases.

For non-roaming use-cases, I would recommend to always set the band and the PLMN ID to ensure faster attach. So please be more patient with the attach time if you don’t set these values.

Hi Matthew,

for NB-IoT there is a technical limitation of 1024 bytes (but this also includes the protocol information). According to our no harm to network guidelines you shouldn’t use more than 1 MB/device/month for NB-IoT.

Hi,
thanks for your answers, very interesting information.
I’ll try it after that date.

Actually the device with the 1nce sim card goes into PSM sleep and also receives GPS-positions but wakes up all 15-20minutes. Also with longer sleep times.

Kind regards,
Christian

I can confirm the issue. I can reproduce it. The problem occurs not due to LTE-M but due to this specific APN (m2m.public.nl). @Uta will take care of this

@aliza-izaton As mentioned earlier, I strongly recommend using a python-based solution.

@Florian-Duecker

Thank you, I guess I need to configure the modem.

@mybeepad-0

One day you will have dreams about AT-commands

(I am talking from experience) 😅

@HNEE Hi Daniel, many thanks. I will check.
I am in the process of acquiring documentation from Quectel distributor but community can provide documents much faster!
Thanks,
Peter

@rxtx Perfect!

Hi @Tibor-Keller you can have a look at this online coverage map for Magyar Telekom’s NB-IoT network https://www.telekom.hu/static-la/sw/file/Nb_IoT_Lefedettseg.pdf

Copy / paste what one of my colleagues wrote:

I must admit I am not sure regarding the polarization used on our cell sites, xn--an article stating that most operators use +/- 45-88b is probably correct. I’ll try to find out and let you know.

That said, knowing the base station antenna’s polarization is not as important as it might appear at first glance. In fact, it only matters in cases where a direct, uninterrupted, line-of-sight exists between the base station antenna and the UE antenna. In most practical cases, the signal the UE sees (and what the base station sees in the uplink case) is a mixture of signals that have been reflected off of and scattered by all kinds of objects (mountains, buildings, trees, vehicles etc.) in and around the line-of-sight. This is called “multipath”.

In a multipath environment, there is no way to predict the polarization of the signal at the receiving antenna, even if the polarization of the transmitting antenna is well known.

This is why the more complex variants of LTE (CAT.1 and above) require at least two antennas, which are typically set up to be sensitive to signals with different polarization.

Hi @uta, thanks for the tip. You’re right, I was using the wrong APN for the type of SIM I have. I have an easy connect SIM, and for that the APN should be just “iot.t-mobile.nl” it turns out (without the CDP bit). Now the UE attaches & registers to the network perfectly fine :D

Hi all,

Please note that network time is now also provided over our LTE-M network in Germany, and can be retrieved with the usual AT commands (e.g. AT+CCLK?, AT+QLTS=2, …)

Best regards,

Ronan

Take this information with a grain of salt until we can get an expert on NB IoT technology to answer this question, but the CE level should be set by the modem based on the measured downlink received signal power and increased automatically when the random access preamble retransmission limit set for the current CE level by the network has been reached.
How long it takes to reach this limit depends on the limit and the period between retries (waiting for the network’s random access response).

@meneerjacco

3GPP and finding the right docs is always challenging and time consuming :-). But once you know the doc number it is well managed and organized to download it:

3GPP document download

I assume you looking for R13 information? The following TS may be interesting

However I have no clue at what power levels the MIBs and SIBs are broadcasted. (afaik you need to sync and collect some info before you can send out the RRC Connection Setup Request)

Maybe somebody else here has more radio experience and knows?

@florian-duecker
Thanks for confirming. I was confused by the information I found in the link (see above)