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Pau Espin 60691b02d2 [MME] Gn: Introduce initial support for 2G->4G cell reselection 
In an Inter-RAT setup a UE could perform a TAU coming from a 2G/3G network.
In that case the UE/MS is unknown to the MME and it should request the
SGSN context (MM, PDP) from the old SGSN. This is done through the following
GTPv1C message exchange on the Gn interface of SGSN and MME:
SGSN <- MME: SGSN Context Request
SGSN -> MME: SGSN Context Response
SGSN <- MME: SGSN Context Acknowledge

Diagram with full set of steps can be found at 3GPP TS 23.401 D.3.6.

This commit doesn't aim to be a complete implementation of the mentioned
procedure, since it's quite a complex one, with lots of fields and logic
required. This so far only implements in general the minimally
successful case by filling as much as possible the required set of
fields.
This will allow for a base onto which do incremental improvements and
fixes while testing against UEs and SGSNs (such as osmo-sgsn, which
doesn't yet support this procedure but will potentially earn it soon).

The reverse direction, aka UE issuing cell reselection 4G->2G was
already implemented (same as here, initial non-complete implementation)
in open5gs-mmed in commit 3d693da73e.

Related: https://osmocom.org/issues/6294
 		2024-01-17 23:05:19 +09:00
.github Add CIFuzz workflow 2023-07-12 22:34:05 +09:00
configs Added open5gs-sepp in debian package 2023-12-17 10:22:39 +09:00
debian Added SEPP debian package (#2861) 2024-01-09 22:12:16 +09:00
docker [WebUI] Fix launch problem in docker (#2767) (#2769) 2023-12-04 22:16:10 +09:00
docs Update VoLTE tutorials 2024-01-10 21:49:48 +09:00
lib [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
misc [SEPP] Initial Update for 5G Roaming (#2739) 2023-11-19 19:34:51 +09:00
src [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
subprojects Fixed prometheus-client-c branch next to open5gs 2022-11-21 22:09:18 +09:00
tests [MME] Hangs on an invalid S1AP message 2024-01-17 20:17:55 +09:00
vagrant [WebUI] Update NodeJS installation Guide 2023-09-03 20:03:47 +09:00
webui Release v2.7.0 2023-12-04 21:14:37 +09:00
.clang-tidy [MISC] Add support for static code analysis 2022-07-01 21:38:47 +09:00
.dockerignore [build] Use local sources to build applications (#1583) 2022-06-19 18:18:09 +09:00
.editorconfig editorconfig: new file (#2746) 2023-11-27 22:21:35 +09:00
.gitignore .gitignore: Add install/ dir 2023-10-10 08:03:25 +09:00
LICENSE Change LICENSE to GNU AGPL v3.0 2017-12-18 10:35:54 +09:00
README.md Update README.md 2022-10-18 22:34:38 +09:00
meson.build Release v2.7.0 2023-12-04 21:14:37 +09:00
meson_options.txt [Fuzzing] oss-fuzz support for fuzzing (#2283) 2023-05-05 17:20:11 +09:00

README.md

Open5GS logo

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.

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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

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License