Configuring WP7702 for NB-IoT


#1

Hi,

I was informed there is no AT command reference yet for the WP7702 module, but that WP76xx has basically the same commands. I am looking through the reference, but cannot find a way to force it to use NarrowBand IoT.
I need to use either LTE Band 3 or Band 20. But for example when trying AT!GETBAND? it throws: !GETBAND: Unknown

Any input on this is appreciated! Thanks.


#2

I spoke with someone on the WP77 team and they had this to say:

Yeah there isn’t a way to force the device into NBIOT mode only right now, that’s still in progress. But we can ask which Release this customer is using. If he’s using Release 7 FW, then he can use AT!SELACQ=LTE-NB1 to force the UE into scanning the LTE NB1 bands first.
and AT!RESET afterwards to apply the setting


#3

Thanks for the answer @dfrey. The firmware I am using is version 02.13.02.00. Not sure what Release it is since it is a custom release provided to us.

Commands returned OK, but I guess there is no way of knowing what network one is using right now? Could you check with the team if there is a AT command reference (other than the WP76xx which states stat !SELACQ is removed) that is up to date for WP77? Thank you again!


#4

Based on my conversation with SW sales team, don’t expect full NB-IOT support until Q2 of 2018


#5

Okay. But just something I thought about. What if you were to put the modem in LTE mode only, and then set AT!SELACQ=LTE-NB1. Wouldn’t that force it to use NB-IoT in theory?


#6

I received another response from the WP77 team member:

they can use AT+COPS? to check what RAT they are currently registered on, after they have successfully registered on the network.

If the RAT shows as 7, it’s LTE CAT-M1. If it’s 9, then it’s LTE NB1 network. From 3GPP specs 27.007 AT+COPS documentation:

: integer type; access technology selected
0 GSM
1 GSM Compact
2 UTRAN
3 GSM w/EGPRS (see NOTE 1)
4 UTRAN w/HSDPA (see NOTE 2)
5 UTRAN w/HSUPA (see NOTE 2)
6 UTRAN w/HSDPA and HSUPA (see NOTE 2)
7 E-UTRAN
8 EC-GSM-IoT (A/Gb mode) (see NOTE 3)
9 E-UTRAN (NB-S1 mode) (see NOTE 4)


#7

Thanks @dfrey!

With AT+COPS? I got:

at+cops?
+cops: 0,0,“244 12 DNA”,9
OK

So I am guessing it is on NB-IoT now. I also forced RAT to LTE (as I mentioned in the previous comment) just to avoid it switching to GSM.