[srsran-users] Issues with connecting UE to gNB with srsRAN

[Matthews, John]

Hello,

I am currently trying to create a 5G network with my university project team. We have attempted two different connections, one with two SDRs and one with an SDR and a phone to serve as the UE. In both cases, the output from the gNB results in the following:

Active RF plugins: libsrsran_rf_uhd.so
Inactive RF plugins:
---  Software Radio Systems LTE eNodeB  ---

Reading configuration file enb.conf...

Built in Release mode using commit 254cc719a on branch master.

Opening 1 channels in RF device=default with args=default
Supported RF device list: UHD file
Trying to open RF device 'UHD'
NG connection successful
[INFO] [UHD] linux; GNU C++ version 9.2.1 20200304; Boost_107100; UHD_3.15.0.0-2build5
[INFO] [LOGGING] Fastpath logging disabled at runtime.
Opening USRP channels=1, args: type=b200,master_clock_rate=23.04e6
[INFO] [UHD RF] RF UHD Generic instance constructed
[INFO] [B200] Detected Device: B210
[INFO] [B200] Operating over USB 3.
[INFO] [B200] Initialize CODEC control...
[INFO] [B200] Initialize Radio control...
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Performing register loopback test...
[INFO] [B200] Register loopback test passed
[INFO] [B200] Asking for clock rate 23.040000 MHz...
[INFO] [B200] Actually got clock rate 23.040000 MHz.
RF device 'UHD' successfully opened

==== eNodeB started ===
Type <t> to view trace
Setting frequency: DL=1842.5 Mhz, DL_SSB=1842.05 Mhz (SSB-ARFCN=368410), UL=1747.5 MHz for cc_idx=0 nof_prb=52
t
Enter t to stop trace.
[INFO] [UHD RF] Tx while waiting for EOB, timed out... 159.14 >= 0. Starting new burst...
RF status: O=1, U=1, L=41
RF status: O=0, U=1, L=31
[INFO] [UHD RF] Tx while waiting for EOB, timed out... 187.136 >= 177.116. Starting new burst...
RF status: O=1, U=1, L=62
[INFO] [UHD RF] Tx while waiting for EOB, timed out... 203.105 >= 189.136. Starting new burst...
RF status: O=1, U=2, L=71
RF status: O=0, U=2, L=16

We have attempted this using VMs installed to a server, as well as on a dual booted install of Ubuntu 20.04 LTS on my personal computer to serve as the gNB & 5G Core. My personal laptop, which produced the above output, has an 8th gen core i7 CPU with the CPU governor set to performance. We have followed the instructions on the srsRAN website, as well as gone through a few forum threads that seemed to have similar issues.

Attached are the config files for the gNB. What are some next steps towards getting a connection?

Sincerely,
John Matthews
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