forked from acouzens/open5gs
Pau Espin
5a31af36e0
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 |
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| .. | ||
| amf | ||
| ausf | ||
| bsf | ||
| hss | ||
| mme | ||
| nrf | ||
| nssf | ||
| pcf | ||
| pcrf | ||
| scp | ||
| sepp | ||
| sgwc | ||
| sgwu | ||
| smf | ||
| udm | ||
| udr | ||
| upf | ||
| main.c | ||
| meson.build | ||