[srsran-users] [srsUE] Problems connecting to srsENB/srsEPC with bladeRF

Fri Dec 16 18:35:21 UTC 2022

Hi Everybody,
somehow I made some progress.
I know can connect with COTS-UEs to an enB running srsRAN and using a bladeRF as Frontend.
But with the same setup a srsUE (using another bladeRF) won't connect to srsenB, it also won't connect to a commercial enB.
I have attached the ue.log and die ue.conf of the test with the commercial enB (ue_commerical_enb.log) and the logs and confs from the tests between srsUe and srsenB/srsEPC.

Also sometimes the logs just stop for a bit and it seems like a minute or so is missing, what could be the cause of this?

Has anybody a clue why the setup works with COTS UEs but not the srsUE?
Help would be greatly appreciated.

Thank you.
Philipp

–
Dipl.-Ing. Philipp Neher
Wissenschaftlicher Mitarbeiter „Echtzeitkommunikation und Steuerungshardware“

Institut für Steuerungstechnik der Werkzeugmaschinen und Fertigungseinrichtungen (ISW)
Universität Stuttgart

Seidenstraße 36 / Zi. 4.025
70174 Stuttgart

Tel: +49 711 685-84499
E-Mail: philipp.neher at isw.uni-stuttgart.de
Web: http://www.isw.uni-stuttgart.de

-----Ursprüngliche Nachricht-----
Von: srsran-users <srsran-users-bounces at lists.srsran.com> Im Auftrag von Neher, Philipp Albert
Gesendet: Freitag, 16. Dezember 2022 16:08
An: Andre Puschmann <andre.puschmann at srs.io>; srsran-users at lists.srsran.com
Betreff: Re: [srsran-users] [srsUE] Problems connecting to srsENB/srsEPC with bladeRF

HI andre,
thank you for the reply.
With the benchmark tool I mean the provided application in /srsRAN/build/lib/src/radio/test/benchmark_radio.

Any idea what could be the problem resulting in the overflows?

Thank you
philipp

–
Dipl.-Ing. Philipp Neher
Wissenschaftlicher Mitarbeiter „Echtzeitkommunikation und Steuerungshardware“

Institut für Steuerungstechnik der Werkzeugmaschinen und Fertigungseinrichtungen (ISW) Universität Stuttgart

Seidenstraße 36 / Zi. 4.025
70174 Stuttgart

Tel: +49 711 685-84499
E-Mail: philipp.neher at isw.uni-stuttgart.de
Web: http://www.isw.uni-stuttgart.de

-----Ursprüngliche Nachricht-----
Von: Andre Puschmann <andre.puschmann at srs.io>
Gesendet: Freitag, 16. Dezember 2022 15:38
An: Neher, Philipp Albert <philipp.neher at isw.uni-stuttgart.de>; srsran-users at lists.srsran.com
Betreff: Re: [srsran-users] [srsUE] Problems connecting to srsENB/srsEPC with bladeRF

Hi Philipp,

all your logs are full of "RF overflows". That will cause issues and all rx/tx timing is wrong. you need to get rid of those.

what exactly do you mean by benchmark tool??

Thanks
andre

On 16/12/22 14:59, Neher, Philipp Albert wrote:
> Hi All,
> 
> sorry for reposting, but after much more trying I’m still stuck on the 
> same point, the srsUE won’t connect to the eNB.
> 
> Since the last post I also tried with another commercial eNB and with 
> a “normal (non-RT) Kernel”, but with the same problem.
> 
> With the commercial eNB I got the benchmark tool to return “OK” after 
> 500s. But no attach, and no Error-Messages in the EPC-Logs.
> 
> Has someone please an idea?
> 
> Thank you
> 
> Philipp
> 
> –
> Dipl.-Ing. Philipp Neher
> Wissenschaftlicher Mitarbeiter „Echtzeitkommunikation und 
> Steuerungshardware“
> 
> Institut für Steuerungstechnik der Werkzeugmaschinen und 
> Fertigungseinrichtungen (ISW) Universität Stuttgart
> 
> Seidenstraße 36 / Zi. 4.025
> 70174 Stuttgart
> 
> Tel: +49 711 685-84499
> E-Mail: philipp.neher at isw.uni-stuttgart.de
> Web: http://www.isw.uni-stuttgart.de
> <http://www.isw.uni-stuttgart.de/>
> 
> *Von:*srsran-users <srsran-users-bounces at lists.srsran.com> *Im Auftrag 
> von *Neher, Philipp Albert
> *Gesendet:* Donnerstag, 1. Dezember 2022 16:41
> *An:* srsran-users at lists.srsran.com
> *Betreff:* [srsran-users] [srsUE] Problems connecting to srsENB/srsEPC 
> with bladeRF
> 
> Hi,
> 
> I’m just starting out with srsran but for the last few days I’m stuck. 
> I hope somebody can point me in the right direction:
> 
> I just can’t get srsUE to connect to srsENB/srsEPC.
> 
> To my understanding it sees the cell but does not connect.
> 
> I tried the same config files with the zmq device and that does work 
> so I think that the problem lies in the RF-part.
> 
> I start both srsenb and srsue with the –rf.device_name=bladeRF and 
> –expert.lte_sample_rates=true options, since I read on the archived 
> mailing list that that might help.
> 
> On the UE PC I used the the “benchmark_radio” and the “pdsch_ue” tool. 
> The benchmark tool always returns “failed” after a 1000s run with “ 2 
> gaps, 0 late timestamps, 2 overflows, 0 underflows” but pdsch_ue 
> report
> pdsch_misses=0 and pdsch_BLER=0.
> 
> My setup:
> 
> 2x PCs (i7-7700 16GB RAM) with Xubuntu 22 and 5.15 Kernel
> 
> 2x BladeRF micro A9
> 
> Both BladeRF connected to each other (TX1 to RX1) using RF-cables and 
> a 20dB attenuator
> 
> srsRAN compiled from source (git tag 22.10)
> 
> Logfiles and config-files are attached.
> 
> Has someone a hint?
> 
> Thank you
> 
> Philipp
> 
> –
> Dipl.-Ing. Philipp Neher
> Wissenschaftlicher Mitarbeiter „Echtzeitkommunikation und 
> Steuerungshardware“
> 
> Institut für Steuerungstechnik der Werkzeugmaschinen und 
> Fertigungseinrichtungen (ISW) Universität Stuttgart
> 
> Seidenstraße 36 / Zi. 4.025
> 70174 Stuttgart
> 
> Tel: +49 711 685-84499
> E-Mail: philipp.neher at isw.uni-stuttgart.de
> <mailto:philipp.neher at isw.uni-stuttgart.de>
> Web: http://www.isw.uni-stuttgart.de
> <http://www.isw.uni-stuttgart.de/>
> 
> 
> _______________________________________________
> srsran-users mailing list
> srsran-users at lists.srsran.com
> https://lists.srsran.com/mailman/listinfo/srsran-users

--
Andre Puschmann

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

PGP/GnuPG key: 0x204A85DFEA324D58
fingerprint: 3924 1C60 D52E 81A2 1F2E 0C9D 204A 85DF EA32 4D58

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