UE Initiated Dedicated Bearer

Giacinto Cifelli gciofono at gmail.com
Mon Apr 26 15:50:58 UTC 2021

Hello Jack,

what is your modem?  Does it support secondary PDNs?
And - mainly - does your subscription support the QOS that you have requested?

Maybe you can switch to a more talkative error report, like AT+CMEE=2


On Mon, Apr 26, 2021 at 5:43 PM Jack Broderick
<jbroderick at councilrock.com> wrote:
> Hello,
> I am currently attempting to setup multiple PDN connections to support QOS by creating a dedicated bearer, configuring the QOS profile and Traffic Flow Template, then sending a request to the MME for this second context.
> I have been following the 3GPP AT command guide to no avail:
> 1. Define a default bearer +CGDCONT: 1,"IP","internet","",0,0,0,0
> 2. Define a dedicated secondary bearer referencing the default bearer: +CGDSCONT: 2,1,0,0
> 3. Define a QOS profile for the dedicated bearer: AT+CGEQOS=2,2,2944,960,10000,10000
> 4. Define a traffic flow template for the QOS profile: AT+CGTFT=2,5,0,,,"5205.5205"
> 5. Activate default bearer (successfully)
> at+cgact=1,1
> OK
> 6. Activate dedicated bearer (unsuccessfully)
> at+cgact=1,2
> I then came across this MR https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/merge_requests/477?commit_id=bb6ed93dda185e679b76f77ffc67aa3a4a9eaf83 which appears to be related to creating multiple bearers and configuring said profiles through MM. I didn't see anything specifically related to QOS/dedicated bearers but it made me wonder if this goal could be accomplished with MM.  I am curious if anyone has experience with creating UE Initiated Dedicated bearers with AT commands? Or, more related to the context of this forum, if there are provisions for this configuration within MM.
> Any support/comments would be greatly appreciated.
> Thanks!
> Jack
> --
> Jack Broderick
> R&D Engineer
> Council Rock
> (585)505-5959
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