8 Commits

Author	SHA1	Message	Date
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
Sukchan Lee	3b0db8c384	Fix the bug for Release-16	2020-07-03 01:03:13 -04:00
Sukchan Lee	6f6800b52e	NGAP is added	2020-05-22 22:24:48 -04:00
Sukchan Lee	552305afe2	Add IMEISV Request	2019-11-18 19:34:28 +09:00
Sukchan Lee	3c8af69805	Re-factoring the all library	2019-09-13 21:07:47 +09:00
Sukchan Lee	a6eb646b76	[SGsAP] MO CS fallback in idle-mode	2019-07-06 22:16:13 +09:00
Sukchan Lee	712b9c8334	[SGsAP] Add TMSI-REALLOCATION-COMPLETE	2019-06-22 12:11:07 +09:00
Sukchan Lee	477f16ad0b	rename project done	2019-06-11 22:10:47 +09:00