srsRAN gNB with srsUE USRP x310

[muril666]

Hi srsRAN team. A try get attach based on srsRAN gNB with srsUE test scenario (https://docs.srsran.com/projects/project/en/latest/tutorials/source/srsUE/source/index.html).
My test setup include two USRP x310
To gnb i use commit 2f90c8b
On tx output on both usrp install 30 db attenuator
soft started on x86 PC with follow config:
gnb
vendor_id : GenuineIntel
cpu family : 6
model : 151
model name : 12th Gen Intel(R) Core(TM) i7-12700
stepping : 2
microcode : 0x32
cpu MHz : 2100.000
cache size : 25600 KB

srsUE
processor : 19
vendor_id : GenuineIntel
cpu family : 6
model : 85
model name : Intel(R) Core(TM) i9-10900X CPU @ 3.70GHz
stepping : 7
microcode : 0x5003303
cpu MHz : 1200.294
cache size : 19712 KB

Test setup diagram:

ue_rf.conf.txt
gnb_rf_b210_fdd_srsUE.yml.txt

Then i start srsUE i see follow output :
Setting manual TX/RX offset to 300 samples
Waiting PHY to initialize ... done!
Attaching UE...
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0xf, tti=2571
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0xf, tti=2731
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0xf, tti=2891
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0xf, tti=3051
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0xf, tti=3211
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0xf, tti=3371
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0xf, tti=3531

in log UE i see that ue decod PBCH and get DCI from PDCCH and try send prach (log ue folllow):
ue.log
but I don't see any messages in the gnb logs about attempts to decode the prach. I see output like this:

2024-05-04T14:58:23.465359 [PHY ] [I] [ 433.1] RX_PRACH: sector=0 offset=513468 size=3356
2024-05-04T14:58:23.625202 [PHY ] [I] [ 449.1] RX_PRACH: sector=0 offset=516824 size=3356
2024-05-04T14:58:23.785232 [PHY ] [I] [ 465.1] RX_PRACH: sector=0 offset=520180 size=3356
2024-05-04T14:58:23.945251 [PHY ] [I] [ 481.1] RX_PRACH: sector=0 offset=523536 size=3356
2024-05-04T14:58:24.105273 [PHY ] [I] [ 497.1] RX_PRACH: sector=0 offset=526892 size=3356

I use follow command to check gnb log tail -F gnb.log | grep -P "PRACH:|PUSCH:"

I try change clock to internal, change rx and tx gain. I tried to ensure that the signal level at the gnb input was the same level as at the ue input (since the signal is successfully decoded on the ue side).

log gnb:
gnb.log

Which log type i can check on gnb side for debug? How i can get input signal level and other params?

[pgawlowicz]

Hi, did you try this? https://docs.srsran.com/projects/project/en/latest/tutorials/source/srsUE/source/index.html#usrp-x300-x310

[muril666]

Thank you very much for your reply. I try check this config, but unfortunately the attach did not work. As far as I understand the problem is that I use cables in my stand to connect between usrp. And as I understand it from the prach capture, it gets into the cyclic prefix. I tried to apply uplink dalay in the srs_ue configuration, but it feels like it wasn't applied.

I use follow config on ue side

[channel.ul]
enable = true
[channel.ul.delay]
enable = true
#period_s = 3600
init_time_s = 0
maximum_us = 100
minimum_us = 100

Maybe there is some other way to arrange a delay for uplink signals?

[pgawlowicz]

in gnb config you have commented out:

  #clock: external 
  #sync: external

could you uncomment to use the external clock for both gnb and ue?

[muril666]

Yes follow you can see config that i use to check attach and log with that config. In this setup i uncomment clock and sync
log_debug_attach.zip

[pgawlowicz]

could you remove the emulated delay and use default configs from this tutorial: https://docs.srsran.com/projects/project/en/latest/tutorials/source/srsUE/source/index.html#over-the-air-setup

please update the default configs for x310, see here: https://docs.srsran.com/projects/project/en/latest/tutorials/source/srsUE/source/index.html#usrp-x300-x310

[muril666]

Hi srsRAN team again. Thank you for your feedback. I solved problem with attach. I fix problem set
time_adv_nsamples = 50
in srsUE config

[mohit4444]

Hi @muril666 please can you share your gNB and UE configs?

[muril666]

Hi @mohit4444 how i remember with config i use in last test
gnb_rf_b210_fdd_srsUE.zip

[mohit4444]

thank you! @muril666

[Sloobot]

I am trying to achieve the same thing. I have this version of the device https://www.sdrstore.eu/software-defined-radio/instruments/usrp/usrp-x310-sdr-2x2-mimo-dc6ghz-160mhz-bw-kintex-7-sfp-pcie/ will there be any differences?