Re: [PATCH 8/8] api: Let MM_MODEM_MODE be a bitfield, and new PreferredMode property

[Aleksander Morgado <aleksander lanedo com>]

On 10/04/2011 01:34 AM, Dan Williams wrote:
>> I do see problems in both implementations, and I understand that the new
>> > one may be more complex, but trying to cope with the addition of 4G to
>> > the list is not an easy task, I would say.
> Yeah, I know.
> 
>> > It would be good to check what modes the new LTE devices support. Is
>> > there anyone out there who can check this? Do the devices support
>> > specifying 'preferred' modes to automatically connect in one mode or
>> > another?
> Unfortunately I don't have any information on this, we'd have to ask
> contacts at Novatel, Sierra, Qualcomm, etc what the plans are here if we
> can.  Qualcomm chips do have the ability to select a different "mode
> preference", and as far as I can tell from the reverse engineering we've
> done, it's a gigantic enum for every mode conceivable because they
> include stuff like WiFi in there too.  Think stuff like
> CDMA/AMPS/HDR/WLAN-only (ie 2G/1G/3G/Wifi only) as a distinct value from
> HDR/LTE only (ie 3G/4G only).  And values for things like "anything
> except WiFi".  So you can bet they've added a bunch more options to that
> enum for LTE.
> 
>> > Also, do the 4G devices support complex setups like "3G preferred, and
>> > if not available go 4G" or "3G preferred, and if not available go 2G".
>> > As a user, I think I can find good reasons to need these last two
>> > options, not just "3G preferred".
> Yeah, that's the question... not sure we have an answer yet.  But I
> guess it would be good to be able to do this since we aren't sure.

Old thread :-)

So, looking at the current set of LTE devices we're playing with, I
didn't find one that supports setups like "2G/3G/4G allowed and 3G
preferred". Devices supporting LTE allow to either select 4G-only or
'auto'. Some cases are even worse, like the LTE sierra modems which now
don't even allow to select previously supported cases like "2G/3G
allowed and 3G preferred".

-- 
Aleksander