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Update PDU Session estab. with SRCtrl/SRGW/Anchor; close #84 #85

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Dec 12, 2024
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Update PDU Session estab. with SRCtrl/SRGW/Anchor; close #84 #85

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27 changes: 17 additions & 10 deletions doc/nextmn-lite.md
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Original file line number Diff line number Diff line change
Expand Up @@ -9,11 +9,13 @@ actor User
participant UE
participant gNB
participant CP
participant UPF
participant SRv6Ctrl
participant SRGW
participant Anchor
rect LightBlue
note over CP,UPF: PFCP Association
CP->>+UPF: PFCP Association Setup Request
UPF->>+CP: PFCP Association Setup Response
note over CP,Anchor: PFCP Association
CP->>+SRv6Ctrl: PFCP Association Setup Request
SRv6Ctrl->>+CP: PFCP Association Setup Response
end
rect Orange
User->>+UE: POST cli/radio/peer(gNBControl)
Expand All @@ -29,18 +31,23 @@ rect Orange
note over User,UE: {<br>"gnb": "http://gnb1.example.org/",<br>"dnn": "srv6",<br>}
end
rect LightGreen
note over UE,UPF: PDU Session Establishment
note over UE,Anchor: PDU Session Establishment
UE->>+gNB: PDU Session Estab. Req.(UEControl)
gNB->>+CP: PDU Session Estab. Req.(UEControl, gNBControl)
CP->>+UPF: PFCP Session Establishment Request(uplinkPDR, uplinkFAR)
UPF->>+CP: PFCP Session Establishment Response
CP->>+SRv6Ctrl: PFCP Session Establishment Request(uplinkPDR, uplinkFAR)
note over CP,SRv6Ctrl: uplink rule cannot be created yet, we still miss the gNB Ip Addr to know the Area
SRv6Ctrl->>+CP: PFCP Session Establishment Response
CP->>+gNB: N2 PDU Session Req.(ulFTEID, UEIpAddr)
gNB->>+UE: PDU Session Estab. Accept
gNB->>+CP: N2 PDU Session Resp.(dlFTEID)
CP->>+UPF: PFCP Session Modification Request(downlinkPDR, downlinkFAR)
UPF->>+CP: PFCP Session Modification Response
CP->>+SRv6Ctrl: PFCP Session Modification Request(downlinkPDR, downlinkFAR)
SRv6Ctrl->>+Anchor: create rule(match <UE>, path <SRGW,gNB+TEID>)
SRv6Ctrl->>+SRGW: create rule(match <UE (UplinkTEID), gNB (Area), Service>, path<Anchor>)
SRv6Ctrl->>+CP: PFCP Session Modification Response
end
rect white
UE<<-->>+Anchor: PDUs
end
UE<<-->>+UPF: PDUs
```

## N2 Handover Scenario 1 (preserve SRGW, preserve Anchor)
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