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Added and integrated UPF graph instead of PFCP associations list

Stefan Spettel requested to merge feature_new_upf_graph into develop

Features

  • Support graph structures of UPF, e.g. N9 interfaces
  • Add UPF graph edge between UPFs when NWI matches the FQDN of another UPF
  • Graph is not fixed to a specific scenario
  • Tested and verified with UL CL scenario (UL CL with 2 N9 interfaces)

Not supported

  • PFCP procedures for the graph
  • Currently, the first "exit" UPF (with N6 interface) is chosen. Thus, PDU session establishment will succeed but user plane is not successful for N9 scenarios

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