[srslte-users] Network Attach Failures on 21.04 SRSUE

[Efosa Ibizugbe]

Hi,
Since switching to the 21.04 UE software, I've observed several Authentication failures, and a few successes using the same eNB and Core Network (both Nokia).
Please see below:

Built in Release mode using commit 1c6dd8c4a on branch HEAD.

Opening 1 channels in RF device=UHD with args=type=x300
Opening USRP channels=1, args: type=x300,master_clock_rate=184.32e6
-- X300 initialization sequence...
-- Determining maximum frame size... 8000 bytes.
-- Setup basic communication...
-- Loading values from EEPROM...
-- Setup RF frontend clocking...
-- Radio 1x clock:184.32
-- Initialize Radio0 control...
-- Performing register loopback test... pass
-- Initialize Radio1 control...
-- Performing register loopback test... pass
Waiting PHY to initialize ... done!
Attaching UE...
.
Found Cell:  Mode=FDD, PCI=204, PRB=100, Ports=2, CFO=-0.7 KHz
Found PLMN:  Id=26299, TAC=1
Random Access Transmission: seq=18, tti=661, ra-rnti=0x2
Random Access Transmission: seq=20, tti=681, ra-rnti=0x2
Random Access Complete.     c-rnti=0xde82, ta=3
RRC Connected

>From the logs above, we stop at RRC Connected, and do not proceed to Network Attach most of the time, only occasionally.
Since nothing has changed on the Ue SIM configuration, eNB or gNB settings, except the use of new UE software - 21.04 can you assist with this issue?

thanks,
Efosa.
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