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Add PDU Session Release documentation

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This commit is contained in:
Guido Casati
2025-11-15 21:04:55 +01:00
committed by Robert Schmidt
parent ed6a25be75
commit c3ef64d292
1 changed files with 33 additions and 0 deletions
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doc/E1AP/e1ap_procedures.md
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@@ -72,3 +72,36 @@ sequenceDiagram
u->>c: BEARER CONTEXT MODIFICATION RESPONSE
Note over c: e1apCUCP_handle_BEARER_CONTEXT_MODIFICATION_RESPONSE
```
## PDU Session Release
```mermaid
sequenceDiagram
participant AMF
participant CUCP
participant CUUP
participant DU
participant UE
AMF->>CUCP: NG PDU SESSION RESOURCE RELEASE COMMAND
Note over CUCP: ngap_gNB_handle_pdusession_release_command
CUCP->>CUCP: rrc_gNB_process_NGAP_PDUSESSION_RELEASE_COMMAND
Note over CUCP: set status PDU_SESSION_STATUS_TORELEASE
CUCP->>CUUP: E1 Bearer Context Modification Request
Note over CUUP: release_gtpu_tunnel (GTP tunnel, PDCP, SDAP)
CUUP->>CUCP: E1 Bearer Context Modification Response
Note over CUCP: rrc_gNB_send_f1_drb_release_request
CUCP->>DU: F1 UE Context Modification Request
Note over DU: handle_ue_context_drbs_release (release in MAC/RLC)
DU->>CUCP: F1 UE Context Modification Response
Note over CUCP: rrc_CU_process_ue_context_modification_response
Note over CUCP: replace existing CellGroupConfig
Note over CUCP: rrc_gNB_generate_dedicatedRRCReconfiguration
CUCP->>UE: RRCReconfiguration (DRB release list, NAS PDU)
UE->>CUCP: RRCReconfigurationComplete
Note over CUCP: handle_rrcReconfigurationComplete
Note over CUCP: rrc_gNB_send_NGAP_PDUSESSION_RELEASE_RESPONSE
CUCP->>AMF: NG PDU SESSION RESOURCE RELEASE RESPONSE
Note over CUCP: rm_drbs_by_pdusession (from stored RRC list)
Note over CUCP: rm_pduSession (from stored RRC list)
```