[srsran-users] highly intermittent attach with srsenb and srsue with bladerf 2.0 micro

[Nitin Jain]

Hi SRS folks,referring to :
Document reference: https://buildmedia.readthedocs.org/media/pdf/srslte-docs/latest/srslte-docs.pdf


I am using srsRAN_4G along with bladeRF 2.0 micro Xa4 in a cabled setup as per following connections:
gNodeB Tx1 (40 dB tx_gain --> UE Rx1 (Agc)gnodeB Rx1 (Agc) <-- UE Tx1 (40 dB tx_gain)No GPSDO used for bladeRF.
Basically, I am using srsenb and srsue on 2 different machine.srsenb and srsepc are running on same machine.
Main issue is that attach is too intermittemt and 1 out of 10 times only, it happens. That too sometimes, it works without any release uptp 20-25 mins and sometimes, it releases within 2-3 mins itself.

I tried to play with time_adv_nsamples in UE side by changing it in steps of 5 right from 27 (default) to 140 but no change in behaviour. I am sharing all configurations by attching zip file having conf files as well as .log files.Please point out to me any obvious issues.My understanding based on logs is that DL is probably working fine and UL is quite flaky.Please share any insights to move forward.

I have also referred issues as per following details:
https://github.com/srsran/srsRAN_4G/issues/688

https://github.com/srsran/srsRAN_4G/issues/1105 Accordingly, I have changed default change in srate in source code and in ue.conf (srate=11.52 e6)
Other Configs:
bladeRF related:bladeRF  2.0 micro XA4bladeRF> version
  bladeRF-cli version:        1.8.0-git-unknown  libbladeRF version:         2.4.1-git-unknown
  Firmware version:           2.4.0-git-a3d5c55f  FPGA version:               0.14.0 (configured by USB host)
Ubuntu versions: Distributor ID: UbuntuDescription: Ubuntu 22.04.3 LTSRelease: 22.04Codename: jammy
srsRAN_4G:
git logcommit fa56836b14dc6ad7ce0c3484a1944ebe2cdbe63b (HEAD -> master, tag: release_23_04_1, origin/master, origin/HEAD)Merge: 921f17484 737c5ae71Author: Codebot <codebot at softwareradiosystems.com>Date:   Mon Jun 19 15:03:18 2023 +0200
    Merge branch 'next' into agpl_next
UE side: Intel i9 13900H gen based machine
gNodeB side: AMD Ryzen 

I also installed SoapySDR and SoapyBladeRF so that native soapySDR based driver can be used.I had to make changes in ue.conf and enb.conf: 
device_name = soapydevice_args = driver=bladerf
https://nickvsnetworking.com/srslte-install-for-bladerf-limesdr-on-debian-ubuntu/#:~:text=bladeRF/hostedx40.rbf%20popd%20git%20clone%20https://github.com/pothosware/SoapyBladeRF.git%20pushd%20SoapyBladeRF%20mkdir%20build%20cd%20build%20cmake%20..








Regards Nitin  
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