5G support in MBIM

[Bjørn Mork]

"Hagstrom, Walter" <Walter.Hagstrom at digi.com> writes:

> I have an EM9190 Sierra Wireless 5G modem, this modem only supports
> MBIM and not QMI; when I make a 5G connection (I can see via !gstatus
> the modem is connected on 5G), MBIM does not advertise any 5G
> capabilities nor does it show the access technology is 5G.  I was
> wondering if there was any support for 5G in MBIM and if anyone was
> working on it.
>
> # mbimcli -d /dev/cdc-wdm0 --query-device-caps
> [/dev/cdc-wdm0] Device capabilities retrieved:
>               Device type: 'embedded'
>            Cellular class: 'gsm'
>               Voice class: 'no-voice'
>                 SIM class: 'removable'
>                Data class: 'umts, hsdpa, hsupa, lte'
>                  SMS caps: 'pdu-receive, pdu-send'
>                 Ctrl caps: 'reg-manual'
>              Max sessions: '15'
>         Custom data class: 'unknown'
>                 Device ID: '351735110101165'
>             Firmware info: '01.04.01.01_Generi_013.001_000'
>             Hardware info: 'EM9190'
> #
>
> # mmcli -m "$INDEX" --command=!gstatus?
> response: '!GSTATUS:
> Current Time:  54245            Temperature: 33
> Modem Mitigate Level: 0         ModemProc Mitigate Level: 0
> Reset Counter: 1                Mode:        ONLINE
> System mode:   ENDC             PS state:    Attached
> LTE band:      B3               LTE bw:      10 MHz
> LTE Rx chan:   1575             LTE Tx chan: 19575
> EMM state:     Registered       Normal Service
> RRC state:     RRC Connected
> IMS reg state: NOT REGISTERED   IMS mode:    Normal
> IMS Srv State: NO SMS,NO VoIP
>
> PCC RxM RSSI:  -51              PCC RxM RSRP:  -69
> PCC RxD RSSI:  ---              PCC RxD RSRP:  ---
> Tx Power:      -44              TAC:         0001 (1)
> RSRQ (dB):     -6.5             Cell ID:     01a2d001 (27447297)
> SINR (dB):     30.0
>
> NR5G band:       n41                    NR5G bw:         100 MHz
> NR5G Rx chan:    518598         NR5G Tx chan:    518598
> NR5G RSRP (dBm): -74            NR5G RSRQ (dB):  -11
> NR5G SINR (dB):  ---            '
> #
>


See the recent thread at
https://lists.freedesktop.org/archives/libmbim-devel/2020-August/001107.html
and the documentation I pointed to:
https://docs.microsoft.com/en-us/windows-hardware/drivers/network/mb-5g-data-class-support

IIUC, libmbim (and MM) must advertise MBIMEx 2.0 support to the device
to get access to all the 5G stuff.

Someone with a 5G modem should probably implement that. Hint, hint :-)



Bjørn