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open5gs/src/mme
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Pau Espin 5a31af36e0 [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
 		2023-12-21 22:11:49 +09:00
..
app-init.c A minor typo fix (#2707) 2023-10-28 22:11:58 +09:00
emm-build.c Reset the number of TA, SLICE, and PLMN supported by AMF/MME(#2761) (#2765) 2023-12-03 23:52:29 +09:00
emm-build.h [MME] Follow-up Cancel Location Handling (#1698) 2022-08-19 16:52:39 +09:00
emm-handler.c [MME] [AMF] Set Daylight Saving Time (#2766) 2023-12-06 20:24:33 +09:00
emm-handler.h Fix the bug for Release-16 2020-07-03 01:03:13 -04:00
emm-sm.c [AMF/MME] UEContextReleaseCommand after Interity Protected (#2786) (#2794) 2023-12-13 17:54:37 +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 [AMF/MME] UEContextReleaseCommand after Interity Protected (#2786) (#2794) 2023-12-13 17:54:37 +09:00
mme-context.h [MME] Gn: Introduce initial support for 4G->2G cell reselection 2023-12-21 22:11:49 +09:00
mme-event.c mme: Introduce initial Gn iface (GTPv1C) support 2023-07-15 23:44:57 +09:00
mme-event.h mme: Introduce initial Gn iface (GTPv1C) support 2023-07-15 23:44:57 +09:00
mme-fd-path.c mme: fix missing memset in mme_fd_init 2023-07-18 09:59:20 +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 4G->2G cell reselection 2023-12-21 22:11:49 +09:00
mme-gn-build.h [MME] Gn: Introduce initial support for 4G->2G cell reselection 2023-12-21 22:11:49 +09:00
mme-gn-handler.c [MME] Gn: Introduce initial support for 4G->2G cell reselection 2023-12-21 22:11:49 +09:00
mme-gn-handler.h [MME] Gn: Introduce initial support for 4G->2G cell reselection 2023-12-21 22:11:49 +09:00
mme-gtp-path.c [MME] Gn: Introduce initial support for 4G->2G cell reselection 2023-12-21 22:11:49 +09:00
mme-gtp-path.h [MME] Gn: Introduce initial support for 4G->2G cell reselection 2023-12-21 22:11:49 +09:00
mme-init.c [SEPP] Initial Update for 5G Roaming (#2739) 2023-11-19 19:34:51 +09:00
mme-path.c [AMF/SMF] Fixed a crash (#2030, #2074, #2085) 2023-02-20 20:49:48 +09:00
mme-path.h no Purge Timer, no config, expanded code 2023-01-24 12:35:47 -06:00
mme-s6a-handler.c [AMF/MME] Remove code that doesn't work (#2013) 2023-07-23 14:54:06 +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] add facility to select smf(pgwu) by tac and e_cell_id. 2023-05-05 10:23:46 +05:00
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] Store decoded PAA into session->ue_ip and session_type 2023-12-19 06:57:35 +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 4G->2G cell reselection 2023-12-21 22:11:49 +09:00
mme-sm.h [CSFB] Create a state machine 2019-06-16 15:40:26 +09:00
mme-timer.c no Purge Timer, no config, expanded code 2023-01-24 12:35:47 -06:00
mme-timer.h no Purge Timer, no config, expanded code 2023-01-24 12:35:47 -06:00
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 [AMF/MME] UEContextReleaseCommand after Interity Protected (#2786) (#2794) 2023-12-13 17:54:37 +09:00
s1ap-handler.h [MME] Implement ENBConfigurationUpdate (#2589) 2023-09-16 20:58:58 +09:00
s1ap-path.c [MME] Implement ENBConfigurationUpdate (#2589) 2023-09-16 20:58:58 +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