[srsran-users] Hand-Over: S1

[Andre Puschmann]

Hey Marcus,

On 7/3/23 13:51, mueller_srs at baseband.digital wrote:
> - Intra-eNB handover happens without srsEPC noticing it; is that right?
>    - How does the split between srsENB and srsEPC map to the CU / DU 
> split in 5g?

The CU/DU split is within the gNB. It has nothing to do with (g/e)NB vs. 
core


> - S1 handover is documented to be unsupported the srsEPC, but supported 
> through replacing that with Open5GS.
>    - What's the intrinsic reason for that? Software complexity? Lack of 
> contributor to implement that?

Yes exactly. srsEPC has always been a testing solution for us to have an 
end-to-end system, never a commercial product.


>    - Supporting other EPCs does sound pretty involved; how well has that 
> proven to work over the air?

Not sure I understand your question. But we have all deployments with 
third-party EPCs and us doing the RAN. So yes, this has been tested 
"over the air".

> 
> - I'm mostly interested in improving the abilities of UEs and the 
> infrastructure to predict good points in time to initiate handovers, so 
> a first step would be observing the messages exchanged between EPC and xNB.
>    - What kind of visibility of channel conditions do I get there?
>    - Are there sensible dissectors for wireshark or even better a good 
> logging infrastructure that can be used for debugging & development?

Yes, both. There is plenty of reading for all 3gpp things and for srsRAN 
I suggest our docs [1].

Hope that helps.

Cheers
Andre


[1] docs.srsran.com
> 
> Best regards,
> Marcus M
> 
> 
> [1] 
> https://docs.srsran.com/projects/4g/en/latest/app_notes/source/handover/source/index.html
> 
> 
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-- 
Andre Puschmann

Software Radio Systems (SRS)
https://www.srs.io
andre at srs.io

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