ENDC cell addition failures due to RACH degradations in NR

5G NR
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Hi Experts.
Are there any cases where we get ENDC cell addition failures due to RACH degradations in NR?
Is it counted in drops or ENDC setup failures in different vendors?

EN-DC retainability suddenly degraded
EN-DC retainability suddenly degraded1536Ɨ1024 457 KB

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2

there is one raison When Msg3 is retransmitted too many times more then max HARQ retransmission & preamble transmission is reached ,RLF is declared

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Hi experts,

We are observing a scenario where EN-DC retainability suddenly degraded, but there were no obvious triggers:

  • No operational/configuration changes
  • No alarms
  • Increase in RACH failures

From the same day, we also noticed a shift in Timing Advance distribution, suggesting possible cell overshooting, however:

  • No increase in attempts or traffic load
  • No changes in tilt, power, or parameters
  • No PCI conflicts detected
  • No neighbor site outages

Has anyone seen a similar case?
Any inputs on what could cause EN-DC retainability degradation along with RACH failure increase and TA shift, despite no visible network changes?

Thanks in advance.

EN-DC retainability suddenly degraded
EN-DC retainability suddenly degraded1536Ɨ1024 457 KB

4

Did you perform site audit for any physical change at antenna? Investigate why the TA distribution is changed suddenly? Also verify if TA pattern at LTE changed too?

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