sysmocom
/
open5gs
forked from acouzens/open5gs
11
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
4,402 Commits 7 Branches 1 Tag 80 MiB
Commit Graph

22 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
Pau Espin 84ed735204 mme: Introduce initial Gn iface (GTPv1C) support 
This interface allows supporting several inter-RAT mobility features
towards pre-rel8-SGSNs (SGSNs without S3/S4 GTPV2C interface).

Related specs:
- 3GPP TS 23.401:
-- "5.6 Network Assisted Cell Change"
-- "5.15 RAN Information Management (RIM) procedures"
--  "Annex D"
- 3GPP TS 23.060 (general GERAN<->GERAN mobility)
- 3GPP TS 29.060
 2023-07-15 23:44:57 +09:00
Sukchan Lee 5ccb5f0f99 SCP(Model D) is now the default setting. 2022-10-22 11:26:04 +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 de2ecd6400 [GTP2] Fixed handling multi-bearer messages(#1498) 2022-04-29 21:28:16 +09:00
Sukchan Lee 433d5f6bf3 Distinguish the type of session creation 2022-04-14 17:34:55 +09:00
Sukchan Lee bf77318602 [MME] re-factor to check a piggybacked ESM (#1431) 2022-03-16 20:48:48 +09:00
Sukchan Lee b4f382d360 [MEM] fix pkbuf problem in multi-threads (#1353) 
We should use talloc in multi-threads instead of pkbuf.
Now, pkbuf library only uses single-thread environment.
 2022-02-19 09:47:44 +09:00
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 6ef5a746e5 NGSetup is added 2020-05-25 12:15:22 -04:00
Sukchan Lee 6f6800b52e NGAP is added 2020-05-22 22:24:48 -04:00
Sukchan Lee c8bcfffe2e [#258] All GTP message is fixed not to crash 2019-11-15 23:56:55 +09:00
Sukchan Lee b65d76d0b2 [#258] Support for receiving unknown TEID 2019-11-07 23:07:29 +09:00
Sukchan Lee 3c8af69805 Re-factoring the all library 2019-09-13 21:07:47 +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 660ebc823f mme_sctp_event_push() interface introduced 2019-06-23 04:22:22 +00:00
Sukchan Lee 6816400247 [SGsAP] continue to work 2019-06-16 21:26:22 +09:00
Sukchan Lee ec7d9f2917 [SGsAP] continue to implement it 2019-06-16 17:33:45 +09:00
Sukchan Lee 0be339e52d [SGSAP] start this feature 2019-06-16 16:47:20 +09:00
Sukchan Lee fa81c86e22 [CSFB] Create a state machine 2019-06-16 15:40:26 +09:00
Sukchan Lee 477f16ad0b rename project done 2019-06-11 22:10:47 +09:00