srsRAN gNB with srsUE over usrp b210 frontends

[thaxir]

Issue Description

I'm following the recent tutorial 'srsRAN gNB with srsUE' from here https://docs.srsran.com/projects/project/en/latest/tutorials/source/srsUE/source/index.html. However, the UE (srsue) never obtains an IP from srsgnb staying at this :

RF status: O=3, U=0, L=0
Scheduling request failed: releasing RRC connection...
Random Access Transmission: prach_occasion=0, preamble_index=0, ra-rnti=0x39, tti=1934

Setup Details

e.g. Network configuration, Operation System, Hardware, RF front-end, library and driver versions

• 2 USRP b210 as RF frontend
• 2 NUCs
• Open5gs
• srsRAN_Project for gnb
• srsRAN_4G for the UE
• Internal clock/no GPSDO
• UHD_3.15. in both nucs

Expected Behavior

Cannot use srsue since it is not properly connected to the gnb

Actual Behaviour

[What happens instead e.g. error message]
Seems like UE attempted a scheduling request but didn't receive a response from the gNB. Not sure though

Steps to reproduce the problem

Additional Information

[Any additional information, configuration or data that might be necessary to reproduce the issue]
gnb.log.txt
ue.log.txt

ue.conf.txt

gnb-config.yml.txt

[pgawlowicz]

UL signal is too strong at the gnb. Please try to tune down srsUE tx_gain and gnb rx_gain.

[thaxir]

Hi @pgawlowicz thank you for the reply.
I have experimented with a lot of changes in both srsUE and gnb as you said but could have any significant result. The only thing i managed to see traffic in the UL was with the tx gain 75 rx gain 35 (see screeshot below) .Other that these i had received one prb with txgain/rxgain at 48/38 but that it only one. The two usrps are very close to each other like 10 cm .

srsue :

Attached are also the latest logs of gnb and srsue and the confs.
ue.log.2.txt

gnb.log.2.txt

gnb.conf.txt
srsue.conf.txt

[thaxir]

any suggestions on this topic ??

[pgawlowicz]

could you try to apply the patch from this comment to srsUE, recompile and try again?
#826 (comment)

[thaxir]

@pgawlowicz Piotr we have done the changes you suggested .
After restarting serveral times srsue and gnb the srsue logs are changed as you see in the snapshot below

Gnb reports this:

and amf in open5gs which is in the same machine with gnb reports this :

which seems that amf rejects the srsue . Do you know why? (

And another question is why do i need to restart several times both srsue and gnb in order to have this connection open and not the Scheduling request failed : releasing RRC connection?
I attach also the logs for ue and gnb.
ue.log.3.txt
gnb.log.3.txt

gnb.log.3.txt

[thaxir]

Any suggestions on this?

[pgawlowicz]

it seems the problem is on the core network side, did you add the UE to the subscriber database?