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20 Commits

Author SHA1 Message Date
Pau Espin 3d693da73e [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
 2023-12-23 09:56:55 +09:00
jmasterfunk84 1e6b1d4f7b
[MME] Implicit Network-initiated Deregistration (#2013) 
* [MME] Introduce aging timers

* Creating three new timers
* mirroring work done by gstaa on the AMF
* Implicit detach procedures added
* Fix for detach from unknown UE

* no Purge Timer, no config, expanded code
 2023-01-26 21:22:17 +09:00
Sukchan Lee e6a14cb73d Move src/../nf-sm.[ch] to lib/sbi/nf-sm.[ch] 2022-08-12 14:03:53 +09:00
Sukchan Lee 5e18b2bd13 [SCP] Support of Indirect Communication 2022-07-16 13:27:18 +09:00
Sukchan Lee de2ecd6400 [GTP2] Fixed handling multi-bearer messages(#1498) 2022-04-29 21:28:16 +09:00
Sukchan Lee 3c3bac6812 4G/EPC: Maintaining Old NAS signalling [#546] 2020-09-03 19:59:00 -04:00
Sukchan Lee 18c483950c Change Number of UEs usage [#533] 
- Set the number of UEs in units of AMF/MME instead of gNB/eNB.
- See default value as shown below
    Number of UEs per AMF/MME : 4,096
    Number of gNB/eNB per AMF/MME : 32
 2020-08-25 23:05:01 -04:00
Sukchan Lee a622feac84 [#256] Remove timer of NAS message related to S1AP 2019-11-18 09:04:10 +09:00
Sukchan Lee dff916551f [#256] Increse T3450 timeout to 6 sec 2019-08-18 00:35:04 +09:00
Sukchan Lee d9238e3036 [#220] fix RACE-CONDITION for MESSAGE and TIMER 2019-07-21 07:01:45 +09:00
Sukchan Lee ae3e59053d [#220] Timer for UE Context Release 2019-07-21 01:03:19 +09:00
Sukchan Lee 5ce04bcc6f [#220] T3489 done 2019-07-20 23:06:54 +09:00
Sukchan Lee 90290d236e [#220] T3460 done 2019-07-20 21:28:36 +09:00
Sukchan Lee 805869da4f [#220] Guard timer instance is created 2019-07-20 20:38:03 +09:00
Sukchan Lee 42f593d360 [TIMER] continue to refine code 2019-07-20 16:39:01 +09:00
Sukchan Lee 6dc66bce85 [TIMER] timer configuration is added 2019-07-20 16:25:09 +09:00
Sukchan Lee f1c913129d [TIMER] Move SGSAP timer to the FSM 2019-07-20 15:34:41 +09:00
Sukchan Lee c1c0b640f3 [TIMER] Move S1-Delayed-Send to the FSM 2019-07-20 15:16:46 +09:00
Sukchan Lee 9565967517 [TIMER] Move timer expiration work to the FSM 2019-07-20 13:07:40 +09:00
Sukchan Lee a96398357f Update New OGSLib commit 2019-07-20 11:20:09 +09:00