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

Mon Dec 19 11:37:08 UTC 2022

Hi Philipp,

some pointers regarding the commercial eNB:

First, attaching to a commercial eNB requires proper network credentials 
to register into the network. In other words, you will have to use a 
card reader and a valid uSIM (hardware) of the operator you want to connect.
Using the default credentials in the soft SIM won’t work:

|##################################################################### # 
USIM configuration # # mode: USIM mode (soft/pcsc) # algo: 
Authentication algorithm (xor/milenage) # op/opc: 128-bit Operator 
Variant Algorithm Configuration Field (hex) # - Specify either op or opc 
(only used in milenage) # k: 128-bit subscriber key (hex) # imsi: 15 
digit International Mobile Subscriber Identity # imei: 15 digit 
International Mobile Station Equipment Identity # pin: PIN in case real 
SIM card is used # reader: Specify card reader by it's name as listed by 
'pcsc_scan'. If empty, try all available readers. 
##################################################################### 
[usim] mode = soft algo = milenage #opc = 
63BFA50EE6523365FF14C1F45F88737D #k = 00112233445566778899aabbccddeeff 
#imsi = 001010123456780 imei = 353490069873329 imsi = 258990800000001 k 
= 0123456789abcdef0123456789abcdef opc = 
ffffffffffffffffffffffffffffffff #reader = #pin = 1234 |

Moreover, to connect to a network, you will have to find out the proper 
frequency or |dl_earfcn| of the cell.
In your config file you have

|##################################################################### # 
EUTRA RAT configuration # # dl_earfcn: Downlink EARFCN list. # # 
Optional parameters: # dl_freq: Override DL frequency corresponding to 
dl_earfcn # ul_freq: Override UL frequency corresponding to dl_earfcn # 
nof_carriers: Number of carriers 
##################################################################### 
[rat.eutra] dl_earfcn = 3100 #nof_carriers = 1 |

However, if you are based in Germany, I don’t think that |3100| this is 
a valid center frequency of any operator: 
https://de.wikipedia.org/wiki/Long_Term_Evolution#2,6-GHz-Frequenzband_(E-UTRA_Band_7_und_Band_38)

To find a proper frequency, you can either do a cell search, or you 
could take a look into 3rd party map services, e.g. 
https://www.cellmapper.net/map?MCC=262&MNC=3&type=LTE&latitude=48.78127549999999&longitude=9.165835567939325&zoom=16&showTowers=true&showIcons=true&showTowerLabels=true&clusterEnabled=true&tilesEnabled=true&showOrphans=false&showNoFrequencyOnly=false&showFrequencyOnly=false&showBandwidthOnly=false&DateFilterType=Last&showHex=false&showVerifiedOnly=false&showUnverifiedOnly=false&showLTECAOnly=false&showENDCOnly=false&showBand=0&showSectorColours=true&mapType=roadmap&darkMode=false 
<https://www.cellmapper.net/map?MCC=262&MNC=3&type=LTE&latitude=48.78127549999999&longitude=9.165835567939325&zoom=16&showTowers=true&showIcons=true&showTowerLabels=true&clusterEnabled=true&tilesEnabled=true&showOrphans=false&showNoFrequencyOnly=false&showFrequencyOnly=false&showBandwidthOnly=false&DateFilterType=Last&showHex=false&showVerifiedOnly=false&showUnverifiedOnly=false&showLTECAOnly=false&showENDCOnly=false&showBand=0&showSectorColours=true&mapType=roadmap&darkMode=false>

You can also use tools like |gqrx| to check if you have a strong signal 
in the spectrogram.

Hope it helps.

Best regards,
Robert

On 16.12.22 19:35, Neher, Philipp Albert wrote:

> 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
>
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-- 

      RobertFalkenberg

Senior Engineer

Software Radio Systems

	robert at srs.io <mailto:robert at srs.io>

	www.srs.io <//www.srs.io>

	Dortmund, Germany

twitter <https://twitter.com/srssystems> 	
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