Missing enum? "Get RF Band Information" (0x0031) / "Bandwidth List" (0x12) -> Value 9

[Dan Williams]

On Sun, 2025-02-23 at 18:32 +0100, Reinhard Speyerer wrote:
> On Wed, Feb 19, 2025 at 12:20:00PM -0600, Dan Williams wrote:
> > On Wed, 2025-02-19 at 18:38 +0100, Martin Maurer wrote:
> > >  
> > > Hi Dan,
> > >  
> > > this is perhaps interesting: The module is not yet
> > > registering/working in the used network. 
> > >  
> > > The LED is still blinking every 2 seconds (time between the 2
> > > seconds: LED dark).
> > >  
> > > (Side note: But I am also not yet able to take Quectel logs:
> > >  
> > > https://forums.quectel.com/t/catching-logs-from-rg255c-gl-with-qlog/44181
> > >   )
> > >  
> > >  
> > > It is a 5G RedCap module and perhaps module/network don't work
> > > yet
> > > each other.
> > 
> > Yeah, I saw it was RedCap and thought maybe that was related (still
> > could be) but then saw that the enum maxes out at 20MHz and there
> > are
> > more bandwidths than that from what I could tell.
> > 
> 
> Hi Dan, hallo Martin,
> 
> according to what I see here with non RedCap devices, 9 means NR5G 20
> Mhz
> while NR5G 10 MHz would be 7. These values are consistent with the
> values from
> https://git.codelinaro.org/clo/le/platform/vendor/qcom-opensource/snaptel-sdk
>  .
> 
> This is another API and it actually uses NR5G_BW_NRB_20 instead of
> NR5G_BW_MHZ_20 but some of its types are isomorphic to the
> corresponding
> Gobi API types.

I think you're right! What about:

https://gitlab.freedesktop.org/mobile-broadband/libqmi/-/merge_requests/395

Dan

> 
> > > Not sure, what "Get RF Band Information" (0x0031) will then
> > > report?
> > >  
> > > There is no connection established by me, because not yet that
> > > far,
> > > to do something like this.
> > >  
> > > Nevertheless I executed the suggested AT commands:
> > >  
> > > AT+QENG="servingcell"
> > > +QENG: "servingcell","LIMSRV","NR5G-
> > > SA","FDD",262,01,4F2872A01,328,7EAE,431070,1,1,-96,-11,5,0,27
> > 
> > We care about the "1,1" here, which means band n1 and 10MHz
> > bandwidth.
> > So maybe 9 means RedCap 10Mhz? But we can't know for sure.
> > 
> > If you're able to get it to register with the network, could you
> > redo
> > this test and see if the values from +QENG change?
> > 
> 
> The problems with the Quectel RG255-GL and the Telekom 5G SA network
> also
> occur with a Fibocom FG132-GL when I set the device to 5G SA only
> mode.
> 
> NASGetSystemInfo only returns ServiceStatus PowerSaveOrDeepSleep
> while both NASGetRFInfo and at+gtccinfo? return a n1 20MHz cell:
>   NASGetRFInfo 3000
>   +OK NASGetRFInfo
> 02040000000000010600010cfa00de93110800010cfa00de930600120600010c09000
> 000
>   at+gtccinfo?
>   +GTCCINFO:
>   NR service cell:
>   1,9,262,01,<TAC>,<CI1>,693DE,<PCI1>,501,20,3,65,65,63
> 
> The only workaround to make the FG132-GL register to the Telekom 5G
> SA network
> I found after some experimentation is to disable 5G SA band n1 after
> which it
> registers on a n28 10MHz cell in the Telekom 5G SA network including
> IMS
> registration:
>   NASGetRFInfo 3000
>   +OK NASGetRFInfo
> 02040000000000010600010c0101ca5b110800010c0101ca5b0200120600010c07000
> 000
>   at+gtccinfo?
>   +GTCCINFO:
>   NR service cell:
>   1,9,262,01,<TAC>,<CI2>,25BCA,<PCI2>,5028,10,3,61,61,61
>   at+cops?
>   +COPS: 1,0,"DTAG",11
>   OK
>   at+cavims?
>   +CAVIMS: 1
>   OK
> 
> This looks like a firmware bug with current Qualcomm SDX35 firmwares
> to me.
> 
> Regards,
> Reinhard
> 
>