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

[Antonio Albanese]

Hey,

try setting the args of the RF device in the enb.conf file to the suggested
ones for USRP.







*# For best performance in 2x2 MIMO and >= 15 MHz use the following
device_args settings:#     USRP B210:
num_recv_frames=64,num_send_frames=64#     And for 75 PRBs, also append
",master_clock_rate=15.36e6" to the device args# For best performance when
BW<5 MHz (25 PRB), use the following device_args settings:#     USRP B210:
send_frame_size=512,recv_frame_size=512*
Cheers!

ᐧ

On Tue, 15 Nov 2022 at 16:24, Matthews, John <jamatthews at wpi.edu> wrote:

> 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
> _______________________________________________
> srsran-users mailing list
> srsran-users at lists.srsran.com
> https://lists.srsran.com/mailman/listinfo/srsran-users
>
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