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When the eNB reported a dedicated bearer in the E-RABFailedToSetupListBearerSURes, s1ap_handle_e_rab_setup_response() only logged "Not implemented : remove dedicated bearer" and kept the bearer context. That bearer was created by mme_s11_handle_create_bearer_request(), so it already held an EPS Bearer Identity taken from the UE bitmap (EBI 5-15). Leaving it behind leaked that identity for good, and the SGW was never told that the bearer had not been established because no Create Bearer Response was sent at all. In a VoLTE deployment where the radio side rejects the dedicated bearer, every call attempt consumed one more EBI. After eleven bearers the bitmap was full and the next Create Bearer Request took the MME down: [mme] WARNING: Cause[Group:1 Cause:25] [mme] ERROR: Not implemented : remove dedicated bearer ... [mme] ERROR: No available EBI (range 5-15) [mme] FATAL: mme_s11_handle_create_bearer_request: Assertion `bearer' failed. Reject the pending Create Bearer Request with "No resources available" and remove the bearer, mirroring the cleanup that a default bearer already gets in the same loop. The transaction id is checked before answering because mme_gtp_send_create_bearer_response() asserts on it, and a dedicated bearer can exist without one: mme_s11_handle_create_bearer_request() returns early when ogs_gtp2_parse_bearer_qos() fails, before bearer->create.xact_id is assigned. That path leaks the bearer as well and is left for a separate change. |
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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.
- Voice and text chat are available in Open5GS's Discord workspace. Use this link to get started.
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.