[srslte-users] does srsLTE support multiple bearers for a UE?

[Andre Puschmann]

Spencer,

we'll be releasing some new code shortly and the bearer setup should be
working with that.

Make sure that the QCI that is used for the 2nd ERAB is configured in
the eNB.

If you're still having issues please open an issue on Github and post
logs and PCAPs as usual.

Cheers
Andre


On 19/12/19 23:35, Spencer Sevilla wrote:
> Hi all,
> 
> I'm currently trying to get VoLTE working using the following setup:
> UE: a OnePlus 6T running LineageOS
> eNB: srsLTE master branch
> EPC: open5gs (formerly NextEPC)
> 
> I think I'm very close right now! Currently, I can see the UE attach to
> the EPC, setup a default bearer to the Internet (APN "internet"), and
> then ask to setup a second bearer for IMS (APN "ims"). However, it looks
> like this second bearer setup process fails (or at least the UE thinks
> it does), and then the UE asks again 5 seconds later.
> 
> In my PCAP (taken between the eNB and EPC) I can see the following
> exchange for the ims APN:
> eNB -> EPC: UplinkNASTransport PDN connectivity request
> eNB <- EPC: E-RABSetupRequest, Activate default EPS bearer context request
> eNB -> EPC: E-RABSetupResponse
> 
> Here, according to good example PCAPs, I expect to see the following
> message:
> eNB -> EPC: UplinkNASTransport Activate default EPS bearer context accept
> but instead, I don't see anything at all - and then 5 seconds later, the
> UE sends another PDN Connectivity Request and repeats.
> 
> I am planning to test with a commercial eNB tomorrow, but in the
> meantime I was wondering if anyone could tell me if srsLTE supports this
> or not? I saw in the GitHub issues (and mailing list archive) that
> srsLTE does not yet support dedicated bearers, but this is simply asking
> to setup a second default bearer. Or maybe I'm mistaken, and this would
> actually be considered a dedicated bearer? Any insight/advice here would
> be greatly appreciated.
> 
> Thanks a ton!
> Spencer
> 
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