[srsran-users] srsUE not connecting to commercial eNB

[Anup Bhattacharjee]

Good Morning All,

Background:
The UE is built in Release mode using commit 5275f3336 on branch master.
SDR: B210.
Computational Unit: NUC
[cid:0a2daf00-b00d-448e-8a92-e08093674ecd]
Antennas used: AntennaType1<https://www.passion-radio.com/gsm/gsm-4g-3g-278.html>, AntennaType2<https://nl.mouser.com/ProductDetail/960-TG.55.8113W>

Problem:
In my current project, I am trying to connect the srsUE to a commercial eNB.

I am able to connect (able to send data through iperf) the srsUE with the srseNB(+srsEPC) in my lab settings (UE and eNB placed around 30-50 cm apart) using antennas and also with coaxial cables.

But when I try to connect to the commercial eNB, after the srsUE sends a "RRCConnectionSetupComplete, Attach request, PDN connectivity request"  message it receives an "RRCConnectionRelease [cause=other]" message. I am attaching the log and pcap file for the srsUE. I have double-checked the settings on the ue.conf, they seem to be fine. COTS UEs are able to connect to the commercial eNB using the same USIM settings.

In order to see that it is not an antenna issue I have done experiments by being around 7-8 meters LOS, but the issue kept repeating itself.

I have changed the freq_offset in ue.conf so that:  -1KHz<=CFO<=1KHz, but the issue kept repeating itself.

May I know if anyone else had similar issues, and how did you resolve them? Or, if anyone has ideas of what I could do to debug this issue better?

Kind Regards,

Anup Bhattacharjee
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