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F1AP refactoring to align with O-RAN.WG5.C.1-v11

Giulio Carota requested to merge f1ap_uecontext_refactoring into develop

The scope of this MR is to align the F1AP to the O-RAN.WG5.C.1-v11 specification. This enables the OAI CU to interact with a LITEON DU (and possibly others).

Changelog

  • Add support for F1AP GNB DU Configuration Update procedure (fully)
  • Send Security Mode Command (SMC) using DLRRCMessageTransfer and make the SMC independent from the UE Context Setup
  • Send DRBs inside the UE Context Setup Request
  • Trigger UE Context Setup after E1 Bearer Establishment
  • Send only one RRCReconfiguration message triggered when PDU Sessions Establishment is accepted
  • Fill MeasurementTimingConfiguration in DU, use in CU: allows to revert limitation in commit eaf28414
  • Correctly indicate released PDU sessions in NGAP Release Complete
  • Fix 5G-S-TMSI encoding
Edited by Robert Schmidt

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