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open5gs/src/mme
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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
..
app-init.c A minor typo fix (#2707) 2023-10-28 22:11:58 +09:00
emm-build.c [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
emm-build.h [MME] Follow-up Cancel Location Handling (#1698) 2022-08-19 16:52:39 +09:00
emm-handler.c [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
emm-handler.h [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
emm-sm.c [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
esm-build.c [MME/SMF] Added Extended-PCO in 4G/LTE (#2261) 2023-04-22 00:06:50 +09:00
esm-build.h Distinguish the type of session creation 2022-04-14 17:34:55 +09:00
esm-handler.c Add trace log for debugging #2287 2023-08-07 22:13:35 +09:00
esm-handler.h [ALL] Fix differences in function parameter names between definition and declaration 2022-07-01 21:38:47 +09:00
esm-sm.c Add trace log for debugging #2287 2023-08-07 22:13:35 +09:00
meson.build mme: Introduce initial Gn iface (GTPv1C) support 2023-07-15 23:44:57 +09:00
metrics.c [AMF metrics] Initial histogram support 2023-03-24 23:03:49 +09:00
metrics.h [METRICS] Re-order init/final (#1985, #2001) 2023-01-20 21:16:45 +09:00
mme-context.c [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
mme-context.h [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
mme-event.c [MME] Gn: Introduce initial support for 4G->2G cell reselection 2023-12-23 09:56:55 +09:00
mme-event.h [MME] Gn: Introduce initial support for 4G->2G cell reselection 2023-12-23 09:56:55 +09:00
mme-fd-path.c MME: support for IDR EPS_USER_STATE 2024-01-13 12:00:20 +09:00
mme-fd-path.h [MME] Add Purge-UE Capability (#1991) 2023-01-14 09:13:48 +09:00
mme-gn-build.c [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
mme-gn-build.h [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
mme-gn-handler.c [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
mme-gn-handler.h [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
mme-gtp-path.c [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
mme-gtp-path.h [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
mme-init.c [SEPP] Initial Update for 5G Roaming (#2739) 2023-11-19 19:34:51 +09:00
mme-path.c MME: support for IDR EPS_USER_STATE 2024-01-13 12:00:20 +09:00
mme-path.h no Purge Timer, no config, expanded code 2023-01-24 12:35:47 -06:00
mme-s6a-handler.c [MME] Gn: Introduce initial support for 4G->2G cell reselection 2023-12-23 09:56:55 +09:00
mme-s6a-handler.h [MME] Add Purge-UE Capability (#1991) 2023-01-14 09:13:48 +09:00
mme-s11-build.c [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
mme-s11-build.h [ALL] Fix differences in function parameter names between definition and declaration 2022-07-01 21:38:47 +09:00
mme-s11-handler.c [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
mme-s11-handler.h [ALL] Fix differences in function parameter names between definition and declaration 2022-07-01 21:38:47 +09:00
mme-sm.c [MME] Gn: Introduce initial support for 2G->4G cell reselection 2024-01-17 23:05:19 +09:00
mme-sm.h [CSFB] Create a state machine 2019-06-16 15:40:26 +09:00
mme-timer.c [MME] Gn: Introduce initial support for 4G->2G cell reselection 2023-12-23 09:56:55 +09:00
mme-timer.h [MME] Gn: Introduce initial support for 4G->2G cell reselection 2023-12-23 09:56:55 +09:00
nas-path.c [AMF/SMF] Fixed a crash (#2030, #2074, #2085) 2023-02-20 20:49:48 +09:00
nas-path.h [MME] Follow-up Cancel Location Handling (#1698) 2022-08-19 16:52:39 +09:00
nas-security.c Shall cipher in the NAS message container IE 2022-01-05 22:39:06 +09:00
nas-security.h Add AUSF, UDM, and UDR 2020-06-04 14:12:05 -04:00
s1ap-build.c Reset the number of TA, SLICE, and PLMN supported by AMF/MME(#2761) (#2765) 2023-12-03 23:52:29 +09:00
s1ap-build.h [MME] Implement ENBConfigurationUpdate (#2589) 2023-09-16 20:58:58 +09:00
s1ap-handler.c [MME] Hangs on an invalid S1AP message 2024-01-17 20:17:55 +09:00
s1ap-handler.h [MME] Implement ENBConfigurationUpdate (#2589) 2023-09-16 20:58:58 +09:00
s1ap-path.c [MME] Fix incorrect function name printed in error line 2024-01-05 05:52:56 +09:00
s1ap-path.h [MME] Implement ENBConfigurationUpdate (#2589) 2023-09-16 20:58:58 +09:00
s1ap-sctp.c [ALL] Removing trailing whitespace and tab 2022-09-02 23:38:39 +09:00
s1ap-sm.c [MME] Implement ENBConfigurationUpdate (#2589) 2023-09-16 20:58:58 +09:00
sbc-handler.c [AMF/MME] Fixed crash when no NG/S1 context(#2012) 2023-01-23 10:37:22 +09:00
sbc-handler.h [CSFB] Fix the MacOSX 2019-07-08 21:03:39 +09:00
sbc-message.h NGSetup is added 2020-05-25 12:15:22 -04:00
sgsap-build.c [MME] SGaAP-MO-CSFB-INDICATION w/ TAI/ECGI (#2664) 2023-10-11 20:37:12 +09:00
sgsap-build.h Refact paging module (#1676) 2022-07-30 14:44:34 +09:00
sgsap-conv.c Re-factoring the all library 2019-09-13 21:07:47 +09:00
sgsap-conv.h Move src/../nf-sm.[ch] to lib/sbi/nf-sm.[ch] 2022-08-12 14:03:53 +09:00
sgsap-handler.c [AMF/MME] Remove code that doesn't work (#2013) 2023-07-23 14:54:06 +09:00
sgsap-handler.h [SGsAP] add MM-INFORMATION-REQUEST(Discard by Option2) 2019-07-21 22:52:28 +09:00
sgsap-path.c Fixed MacOSX compile error 2023-04-04 21:53:39 +09:00
sgsap-path.h [SGsAP] Changed message if Paging failed (#1701) 2022-08-19 18:58:55 +09:00
sgsap-sctp.c [ALL] Removing trailing whitespace and tab 2022-09-02 23:38:39 +09:00
sgsap-sm.c [LOG] remove ogs_expect_or_return()/return_val() 2023-01-24 00:01:36 +09:00
sgsap-types.h [MME] SGaAP-MO-CSFB-INDICATION w/ TAI/ECGI (#2664) 2023-10-11 20:37:12 +09:00