5G Signal properties

[Sebastian Sjoholm]

Hi Nick,

Since the system is 5G NSA (none stand alone), only the user data is used
with the 5G, the control data is still using LTE. Therefor if there are no
active user data, the 5G NSA status would not be active, it will activate
during data usage (this would be the normal behaviour). So, when the modem
is idle (on LTE) you will not get 5G NR signal data.

The band info (TLV info) is not related as it is static modem info, and as
we have noted now that this seems to be varied depending on the FW. I guess
we need to wait a while until the commercial units are out to make final
assumption where this will go.

Regards,
Sebastian


On Tue, Jun 9, 2020 at 11:21 PM Nick <mips171 at icloud.com> wrote:

> Hi Reinhard,
>
> A new development -- while on the 5G network with an active data
> connection (MM connected and ifup on the interface) I could get the real 5G
> values via the AT command, however the TLV was still missing from the
> verbose output of —dms-get-band-capabilities.  Still, UL/DL performance
> was, disappointingly, still about what you would expect from one LTE band,
> but that is probably its own topic.
>
> Here’s the AT command response:
> at+qeng=“servingcell”
> +QENG: “servingcell”, “NOCONN”
> +QENG: “LTE”,”FDD”,505,01,8C62D06,182,9410,28,5,5,7025,-78,-7,-51,15,-
> +QENG:”NR5G-NSA”,505,01,839,-83,154,-12
>
> at+qeng=“servingcell”
> +QENG: “servingcell”, “NOCONN”
> +QENG: “LTE”,”FDD”,505,01,8C62D06,182,9410,28,5,5,7025,-81,-8,-53,14,-
> +QENG:”NR5G-NSA”,505,01,839,-93,60,-12
>
>
> Best,
> Nick
>
>
> > On 10 Jun 2020, at 3:12 am, Reinhard Speyerer <rspmn at arcor.de> wrote:
> >
> > On Tue, Jun 09, 2020 at 08:50:10AM +1000, Nick wrote:
> >> Hi Walter,
> >>
> >> I???m seeing a similar issue with my RM500Q-GL.  Can you please post
> the output of: qmicli -p -d /dev/cdc-wdm0 --dms-get-band-capabilities
> >>
> >> Mine below for your reference.  You would note on mine, after the
> Extended LTE bands, where we would expect to see the 5GNR band TLV
> response, that it is absent. (Thanks to Sebastian for showing me that.)
> However, I am currently not attached to a 5G network, nevertheless, when I
> attempted this test while attached to a 5G network, I had the same result.
> >>
> >>
> >> Best,
> >> Nick
> >>
> >>
> >> When I was on 5G
> >> ---------------
> >> AT+QENG="Servingcell"
> >> +QENG: "servingcell","NOCONN???
> >> +QENG:
> "LTE","FDD",505,01,8B45502,349,1300,3,5,5,700B,-83,-10,-53,20,0,-150,-
> >> +QENG: ???NR5G-NSA???,505,01,45,-32768,-32768,-32768 (note the negative
> values for signal, equivalent to 0b1000000000000000)
> >> --------------
> >> Responses for AT+QENG 5GNR: Access Tech, MCC, MNC, PCID, RSRP, SINR,
> RSRQ
> >>
> >
> > Hi Nick,
> >
> > same over here when using a test network in 5G NSA mode:
> >
> > at+qeng="servingcell"
> > +QENG: "servingcell","NOCONN"
> > +QENG: "LTE","FDD",1,01,1A2D001,1,300,1,3,3,1,-87,-3,-67,23,255,-32768,52
> > +QENG:"NR5G-NSA",1,01,500,-32768,-32768,-32768
> >
> > OK
> >
> > NASGetSignalInfo output for 5G NSA (from another test, still with the
> RG500Q):
> > +OK NASGetSignalInfo
> 02040000000000140600bffaa8ffb600170400008000801802000080
> >
> > My assumption is that RSRP, SINR and RSRQ above would only be defined for
> > 5G SA mode as can be seen from the qmicli -v --nas-get-signal-info
> output here
> > https://gitlab.freedesktop.org/mobile-broadband/libqmi/-/issues/32 .
> >
> > I tried to stay out of the "guessing 5G QMI TLVs" business but since we
> > may never see a GobiAPI 2020 update here it goes anyway:
> > TLV 0x17 = RSRP and SINR (scaled by 10 like for LTE(?)), TLV 0x18 = RSRQ.
> >
> > A TLV that looks a little bit easier to guess due to its unusual size:
> > NASGetSystemInfo TLV 0x50 = 5GS TAC from TS 24.501 section 9.11.3.8.
> >
> > Regards,
> > Reinhard
>
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