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On a GTP-U Error Indication for an EPC session, the SMF deleted the whole PFCP session for any Error Indication and never notified the MME. A single transient, handover-induced Error Indication on a dedicated (voice) bearer therefore tore down the entire IMS PDN, and because no Delete Bearer Request was sent to the MME, the MME and UE kept a stale IMS PDN connection - the UE could not place a new VoLTE call until it re-attached. SMF (src/smf/n4-handler.c, src/smf/pfcp-path.c): Map the Error Indication FAR to its bearer and run a PGW-initiated bearer deactivation instead of a blind session deletion, per 3GPP TS 23.007: - dedicated bearer -> deactivate only that bearer (IMS PDN survives); - default bearer -> deactivate the whole PDN connection. smf_gtp2_send_delete_bearer_request() sets the Linked EBI (default) or the EPS Bearer ID (dedicated), so the MME deactivates the EPS bearer toward the UE and stays in sync. The PFCP session is deleted on the Delete Bearer Response (wait_pfcp_deletion). The default-bearer case uses cause "Reactivation requested" so the UE re-establishes the PDN. MME (src/mme/mme-s11-handler.c, mme-path.c, mme-context.h, nas-path.c, nas-path.h, esm-sm.c): Map the GTPv2 Cause "Reactivation requested" (#8) on a default-bearer Delete Bearer Request to NAS ESM cause #39 "reactivation requested" (TS 29.274 Table C.3) so the UE re-establishes the IMS PDN. The mapping is restricted to the default bearer (Linked EBI). Carry the ESM cause across paging in mme_ue->paging.esm_cause so an ECM-IDLE UE also receives it after paging; previously the post-paging path always used REGULAR_DEACTIVATION. The TS 29.274 Table C.3 "re-attach required" mapping for the last PDN connection is intentionally not implemented (Attach without PDN connectivity and SCEF PDN connections are not supported here); the last default bearer is deactivated with ESM cause #39 as well. Issues: #4659 |
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Getting Started
Please follow the documentation at open5gs.org!
Sponsors
If you find Open5GS useful for work, please consider supporting this Open Source project by Becoming a sponsor. To manage the funding transactions transparently, you can donate through OpenCollective.
Community
- Problem with Open5GS can be filed as issues in this repository.
- Other topics related to this project are happening on the discussions.
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Contributing
If you're contributing through a pull request to Open5GS project on GitHub, please read the Contributor License Agreement in advance.
License
- Open5GS Open Source files are made available under the terms of the GNU Affero General Public License (GNU AGPL v3.0).
- Commercial licenses are also available from NewPlane at sales@newplane.io.
Support
Technical support and customized services for Open5GS are provided by NewPlane at support@newplane.io.