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{hscale=1}
upf = User Plane function
cpf = Control Plane function
cpf () . Look up UPF,
pick any one of the available
IP addrs for the UPF
...
upf <> cpf not yet associated
upf () cpf reject any session related msgs
...
upf < cpf PFCP Association Setup Request
CP function Node Id, features
upf > cpf PFCP Association Setup Response
UP function Node Id, features
upf <> cpf associated
upf () cpf start Heartbeat checking
...
upf < cpf Heartbeat Request
upf > cpf Heartbeat Response
...
upf > cpf Heartbeat Request
upf < cpf Heartbeat Response
...
upf < cpf Session Establishment Request
CP Node-Id
CP F-SEID
1+ Packet Detection Rule(s)
1+ Forward Action Rule(s)
upf > cpf Session Establishment Response
upf < cpf Session Modification Request
upf > cpf Session Modification Response
upf < cpf Session Deletion Request
upf > cpf Session Deletion Response
...
upf () cpf F-SEID: accept any other IP addrs than peer's Node Id
...
--- Graceful release initiated by CP
upf < cpf Association Update Request
with PFCP Association Release Preparation Start = 1
upf > cpf Association Update Response
upf > cpf Session Report Request
to report non-zero usage reports,
at least one message per PFCP Session
upf < cpf Association Release Request
upf > cpf Association Release Response
--- Graceful release initiated by UP
upf > cpf Association Update Request
with PFCP Association Release Preparation = 1
cpf <> . refrain from establishing sessions
upf < cpf Association Update Response
upf < cpf Session Deletion Request(s)
to collect usage reports
per session
upf > cpf Session Deletion Response(s)
cpf () . wait Graceful Release Period
upf < cpf Association Release Request
upf > cpf Association Release Response
--- Release (immediate)
upf < cpf Association Release Request
upf > cpf Association Release Response
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