UE and srsGNB cannot connect together

[xdnewlun1]

Issue Description

I have setup Open5GS and the srsGNB on Ubuntu 22.04 Desktop. The COTS UE I am trying to use is the CrossCall Core-Z5 which I have successfully used on other 5G projects. When connecting the 5G UE to the GNB, the UE will attempt to connect to the PLMN 901 70 5G for about 3 minutes then will say connection unavailable. In packet captures there are no packets from the UE trying to register with the Core. (See Packet Capture below)

Setup Details

Ubuntu 22.04 Desktop
32 Core - 128GB RAM

Ettus Research B210 w/ Leo Bodnar external gps clock
UHD v4.6.0.0

Open5GS v2.7.0
srsRAN 5G gNB v23.10.1 (bcf941b)

Expected Behavior

When the PLMN is discovered by the UE, it should be able to connect to the RAN and show packets in wireshark attempting to register with the Core.

Actual Behaviour

The UE attempts to connect to the RAN but eventually fails out with no packets shown in WireShark.

Steps to reproduce the problem

See Configuration Files and Packet Captures in zip file, GitHub was being weird about uploading multiple files.
troubleshooting-documents.zip

[pgawlowicz]

Hi, Could you collect gnb logs with increased logging level?

[xdnewlun1]

Here is the gnb_log with debug logging level.
File was too big to upload, so i had to compress it first.
gnb_log.zip

[pgawlowicz]

could you try to reduce rx_gain at gnb?

[xdnewlun1]

I can test this on Monday, and will let you know how it goes.

[xdnewlun1]

I tested it today and at a level of 30, 20, and 10 there was still no show of PLMN on the UE, or any packets in Wireshark showing an attempt to connect from the UE.

[pgawlowicz]

could you share logs for each rx_gain config?

[desimetallica]

I'm quite interested, I've the same smartphone and I can't even find the network... Do you have rooted the phone and installed the Network Signal Guru as indicated in the guide ?

[flenz00]

Same issue here

[xdnewlun1]

I did not root the device as asked by @desimetallica. I did however recently get a Google Pixel 6 connected using the following gnb config. I had to change to a lower bang and band 71 was working with most of the devices i checked.
gnb_config_as_a_pdf.pdf

[flenz00]

Thanks, but with those values, the crosscall still didn’t work right?

[xdnewlun1]

Yeah, which is why I am still testing to try and figure out how to get the crosscall working.

[desimetallica]

we are trying to do the same. We have also an Ericsson gnb over our heads (dot product from ericsson for indoor coverage), and we can find it in "5gforce" application, the network actually appears with its NRARFC MCC and MNC. On the contrary for our deployment with srsRAN_project we can't see the network. No matter what frequencies or bands we are using.

[xdnewlun1]

Yeah, I am running into the same problem. I have a deployment of a proprietary 5G that works on band n77, but when i use the exact smae radio sepcs on the srsRAN I get nothing on the phone.