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msc {
hscale="1";
upf[label="User Plane function"],cpf[label="Control Plane function"];
cpf rbox cpf [label="Look up UPF,\npick any one of the available\nIP addrs for the UPF"];
...;
upf abox cpf [label="not yet associated"];
upf rbox cpf [label="reject any session related msgs"];
...;
upf <<= cpf [label="PFCP Association Setup Request\nCP function Node Id, features"];
upf =>> cpf [label="PFCP Association Setup Response\nUP function Node Id, features"];
upf abox cpf [label="associated"];
upf rbox cpf [label="start Heartbeat checking"];
...;
upf <<= cpf [label="Heartbeat Request"];
upf =>> cpf [label="Heartbeat Response"];
...;
upf =>> cpf [label="Heartbeat Request"];
upf <<= cpf [label="Heartbeat Response"];
...;
upf <<= cpf [label="Session Establishment Request\nCP Node-Id\nCP F-SEID\n1+ Packet Detection Rule(s)\n1+ Forward Action Rule(s)"];
upf =>> cpf [label="Session Establishment Response"];
upf <<= cpf [label="Session Modification Request"];
upf =>> cpf [label="Session Modification Response"];
upf <<= cpf [label="Session Deletion Request"];
upf =>> cpf [label="Session Deletion Response"];
...;
upf rbox cpf [label="F-SEID: accept any other IP addrs than peer's Node Id"];
...;
--- [label="Graceful release initiated by CP"];
upf <<= cpf [label="Association Update Request\nwith PFCP Association Release Preparation Start = 1"];
upf =>> cpf [label="Association Update Response"];
upf =>> cpf [label="Session Report Request\nto report non-zero usage reports,\nat least one message per PFCP Session"];
upf <<= cpf [label="Association Release Request"];
upf =>> cpf [label="Association Release Response"];
--- [label="Graceful release initiated by UP"];
upf =>> cpf [label="Association Update Request\nwith PFCP Association Release Preparation = 1"];
cpf abox cpf [label="refrain from establishing sessions"];
upf <<= cpf [label="Association Update Response"];
upf <<= cpf [label="Session Deletion Request(s)\nto collect usage reports\nper session"];
upf =>> cpf [label="Session Deletion Response(s)"];
cpf rbox cpf [label="wait Graceful Release Period"];
upf <<= cpf [label="Association Release Request"];
upf =>> cpf [label="Association Release Response"];
--- [label="Release (immediate)"];
upf <<= cpf [label="Association Release Request"];
upf =>> cpf [label="Association Release Response"];
}
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