Reasons for sgNB release in NSA

5G NR
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1

Hi Experts.

What can be other reasons for sgNB release in NSA network apart from below mentioned?

  1. A2 based sgNB release feature if enabled
  2. RLF
  3. OOS

What can be other reasons?

2

For release of SgNB initiated by SgNB can be on following cases: low RSRP and so eventA2 is triggered.
For release of SgNB initiated by MeNB can be on following cases:
UE is handovered from an anchor eNodeB (MeNB) to a non anchor eNodeB.
There is an SCG failure.
Packets on GTP-U control plane are lost.
SgNB is in inactive state depending on UEInactivityTimer

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Also observed sudden release of sgNB for the CSFB call