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Signalling flows related to 5GS procedures (TS 23.502)

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Registration Management procedures

  General Registration
  Registration with AMF re-allocation
  UE-initiated Deregistration
  Network-initiated Deregistration

Service Request procedures

  UE‑Triggered Service Request
  Network‑Triggered Service Request

Session Management procedures

  UE‑requested PDU Session Establishment for non‑roaming and roaming with local breakout
  UE‑requested PDU Session Establishment for home‑routed roaming scenarios

Handover procedures

  Xn‑based inter NG‑RAN handover without UPF re‑allocation
  Inter NG‑RAN node N2‑based handover, Preparation phase
  Inter NG‑RAN node N2‑based handover, Execution phase
  5GS to EPS handover for single‑registration mode with N26 interface
  EPS to 5GS handover using N26 interface, Preparation phase
  EPS to 5GS handover using N26 interface, Execution phase