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Pau Espin e84450bfc1 [MME] Gn: Introduce initial support for 4G->2G cell reselection 
In an Inter-RAT setup a UE could perform a RAU coming from a 4G network.
In that case the UE/MS is unknown to the SGSN and it should request the
SGSN context (MM, PDP) from the MME. 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

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).

This commit doesn't implement the reverse direction, aka UE issuing cell
reselection 2G->4G. Initial support for this scenario will hopefully be
added soon as a follow-up patch, similar to this one.

Related: https://osmocom.org/issues/6294
(cherry picked from commit 3d693da73e)
 		2024-01-29 14:17:39 +01:00
.github Add CIFuzz workflow 2023-07-12 22:34:05 +09:00
configs example config: some thoughs about static profiles 2023-10-31 13:26:34 +01:00
debian d/changelog: add 2.6.6~sysmocom2 2024-01-26 16:54:16 +01:00
docker Prometheus metrics set to default 2022-11-21 22:06:29 +09:00
docs [DOCS] Open5GS works with eUPF(eBPF/XDP UPF) 2023-10-31 20:57:03 +09:00
lib [MME] Gn: Introduce initial support for 4G->2G cell reselection 2024-01-29 14:17:39 +01:00
misc HSS: Add support for Operator-Determined-Barring field 2023-10-12 07:17:54 +09:00
src [MME] Gn: Introduce initial support for 4G->2G cell reselection 2024-01-29 14:17:39 +01:00
subprojects Fixed prometheus-client-c branch next to open5gs 2022-11-21 22:09:18 +09:00
tests [SBI] Do not raise ASSERT when not enough CLIENT pool (#2701) 2023-10-25 21:40:37 +09:00
vagrant [WebUI] Update NodeJS installation Guide 2023-09-03 20:03:47 +09:00
webui HSS: Add support for Operator-Determined-Barring field 2023-10-12 07:17:54 +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
.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 PCRF: allow to build without mongodb 2023-10-31 13:26:34 +01:00
meson_options.txt PCRF: allow to build without mongodb 2023-10-31 13:26:34 +01:00

README.md

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Getting Started

Please follow the documentation at open5gs.org!

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  • 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