Re: 4G internet connection (LTE) on Huawei E398

[Dan Williams <dcbw redhat com>]

On Thu, 2012-03-22 at 11:35 -0700, Marcel Holtmann wrote:
> Hi Dan,
> 
> > > > I can't connect to 4G using Huawei E398 on Ubuntu 11.10.  Connection to
> > > > 3G work fine.
> > > >
> > > > Are you planning to implement in the near future 4G network service in
> > > > network-manager? Can I help somehow?
> > > >
> > > 
> > > There is work in progress in ModemManager to support LTE devices.
> > > 
> > > Which are the specific issues you face when connecting in 4G mode? You 
> > > could help us by providing ModemManager debug logs as explained in the 
> > > "Debugging NetworkManager 0.8 and 0.9 3G connections" section at 
> > > https://live.gnome.org/NetworkManager/Debugging
> > 
> > That device is the one Bjorn was working on supporting via the cdc-wdm
> > and qmi_wwan drivers on the kernel side.  It's got an AT port I think
> > but we really, really want to use QMI and the net port for it.
> 
> actually the EPS AT commands for the E398 are broken. If you would try
> to use them, in most cases the modem will just crash. I bet that the
> manufactures will need a long time to get these anywhere near stable.
> 
> And on the same note, the Sierra LTE cards just hides this behind the
> PDP AT commands. That is also not conforming to the specification.
> 
> As of today, I have not seen a single LTE modem, that behaves properly
> according to 27.007.

Yeah, I think most manufacturers are favoring their proprietary
protocols for the time being, whether that's CnS, WMC, QMI, or whatever
crack LG is doing with their VL/ADU600.  Which is somewhat unfortunate.

Dan