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5G PDU Session Management

5G PDU session management procedures show how user-plane service is created, updated, released, and preserved across policy or mobility changes. Use this hub to jump into PDU session establishment, network-requested sessions, secondary sessions, IMS PDU sessions, emergency PDU sessions, slice-aware session setup, modification, release, SSC mode change, mobility recovery, and idle or inactive reactivation call flows.

What This Covers

PDU session establishment procedures create the 5G user-plane context for data, IMS, emergency service, and slice-aware connectivity.

Modification, release, SSC mode change, and recovery flows update or preserve active sessions after policy, mobility, or service-state changes.

Use the links below to jump directly into PDU session setup, specialized session variants, modification, release, continuity, and recovery call flows.

Core Session Setup

Procedures that create new PDU sessions and activate the first session-level user-plane path.

Specialized Session Variants

Session-establishment branches used for IMS, emergency handling, and slice-aware service needs.

Session Update and Continuity

Procedures that modify or preserve existing sessions after mobility, policy change, or service return.

Related 5G Paths

  • 5G Access & Registration Covers initial access, registration, authentication entry points, service request triggers, and the end-to-end UE to AMF registration sequence in 5G networks.
  • 5G Mobility Procedures Focuses on handover, tracking area updates, inter-gNB mobility, path switch, and session continuity during movement across the network.
  • 5G RRC Procedures Includes RRC setup, resume, reconfiguration, release, paging response, and other radio control exchanges between the UE and gNB.
  • 5G Security Procedures Describes authentication, NAS security activation, AS security setup, key derivation, and security mode related call flows in 5G.
  • PDU Session Establishment UE creates data session
  • PDU Session Modification Change QoS or resources