RLF cause as PDCP UL release in UE LTE logs

4G LTE
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21

@Pritam.Nandy Which logcode do you refer to find LTE RLF cause code?

22

@merishi We checked in QCAT but don’t remember the log code exactly.

23

@Pritam.Nandy

I am observing below RLF cause on QXDM:
RLF Count since RRC Connected = 1
RLF Count since LTE Active = 1
RLF Cause = PDCPUL_RL_FAILURE

Background:

  1. NSA - SN terminated SCG split bearer,
  2. 4G+5G cell (say “A”) NSA worked fine.
  3. When we are bringing-up another 4G cell (say B) with A’s 5G cell configured with it (i.e. cuup of 5G), we are getting RLF on “A” just after NSA attach. B is fully attenuated, no scope of Handover.
  4. RLF occured and then LTE RRC Reestablishment request with “other failure” mentioned.

Can you suggest what could be the issue here. Thanks in advance