SGNB addition procedure not successful causes

5G NR
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“SGNB addition procedure is not successful” - a common snag in NSA Attach procedure, with various possible causes.

Here’s a pocket guide to NSA successful call flow, extracted from captured Wireshark PCAP data, highlighting the message sequence (excluding UE side messages).

  1. LTE side pcap snippet
  2. NR side pcap snippet

LTE side pcap snippet
LTE side pcap snippet1248×466 69.2 KB

NR side pcap snippet
NR side pcap snippet1100×486 63.3 KB

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