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UE-initiated Service Request Procedure in stack

Reference: 5.6.1.1 of 24.501

The Service Request procedure is used for transitioning the UE from 5GMM-IDLE to 5GMM-CONNECTED mode.

This procedure is initiated by the UE or triggered by the network via paging or notification procedures.

This feature is currently missing in our 5GMM implementation.

UE-Initiated:

  • Uplink signaling or user data pending in 5GMM-IDLE mode.
  • No user-plane resources established for PDU sessions in 5GMM-CONNECTED mode.

PDU Session Management:

  • Establishment of user-plane resources for PDU sessions under specific constraints based on the Multiple user-plane resources support bit in the 5GMM capability IE.

State and Conditions

  • TAI of the current serving cell is in the TAI list.
  • No ongoing 5GMM-specific procedures.
  • 5GS update status is 5U1 UPDATED

What is needed:

  • State machine in the 5GMM layer (5GMM Mode, 5GMM state)
  • Callback based on trigger (e.g., uplink signaling/user data)
  • Service Request Attempt Counter as per 5.6.1.7.

Pending !2984 (merged) and !3176 (merged)