As per 3GPP TS 29.060 version 15.3.0, section 7.3.3, 7.3.4, 7.3.5 and 7.3.6
Only if PCO IE is included in Update/Delete PDP Context Request then it
must be present in Update/Delete PDP Context Response.
In order to reflect on whether the request contained PCO IE or not
the SMF context containing the GTP request needs to be updated
i.e. update if present else clear the contents
As per 3GPP TS 29.274 version 10.5.0, section 7.2.9 and 7.2.10,
Only if PCO IE is included in Delete Session Request then it
must be present in Delete Session Response.
In order to reflect on whether the request contained PCO IE or not
the SMF context containing the GTP request needs to be updated
i.e. update if present else clear the contents
Do not Set Origin-Hosts with fd_msg_rescode_set before potential use of ogs_diam_message_experimental_rescode_set. This results in multiple Origin-Host/Realm AVPs.
- Added diameter dictionary definitions for Cancel Location
- Cancel Location will completely remove UE from MME, allow for a fresh IMSI attach to occur on next attempt.
- T3422 is used for detach request.
- Added new handling for s6a events in mme-sm, as not all s6a messages are at attach now. Maybe there's something in a state machine I should've been using here instead of a new flag?
- Testing was completed with UE in idle and connected. With CLR flags indicating re-attach required and without. Also sending CLR after UE detach. And then sending again when mme_ue is empty.
Found no support for HSS provided charging characteristics. Following TS32.251 A.4:
- Use PDN level CC, if one wasn't provided then use subscription level CC
- Don't send CC in S11 if it wasn't included
For HSS's which do not include the NAM, the MME should not treat this as a fatal error. MME should just assume PACKET_AND_CIRCUIT (0), as was decided in a previous PR.
In case there are multiple AMF registered to NRF, SMF would pick only
the first AMF from the list.
In the case of sending PDU Session Establishment Accept from SMF to
AMF, this would mean a high chance of failure since the AMF might
be different than the original requester, and would not know about a
particular UE.
Modify SMF to use ServingNfId field from original request
SmContextCreateData from AMF to determine to which AMF should it send
PDU Session Establishment Accept message.
The issue was introduced with the commit, which builds Open5GS from
local sources instead of downloading them each time from Github.
Fixes: d2cbcf711 ("[build] Use local sources to build applications (#1583)")
When a UE that requests slices tries to connect and there are no slices configured, the reject message is:
5GMM cause = 0x7 (5GS Services not allowed)
however it should be:
5GMM cause = 0x3e (No network slices available)
All 5GMM cause value in reject message is reviewed in this commit
UDM may send a Deregistration Notification to AMF, to deregister
specific UE from the network - Network-Initiated Deregistration.
Deregistration procedure includes sending Deregistration Request to UE,
starting a timer T3522, releasing PDU sessions from SMF, releasing PCF
policies from PCF, and waiting for Deregistration Accept from UE.
Not yet implemented is:
- to prevent deregistration of UE in case it has any emergency sessions,
- page UE when UE is in IDLE mode.
According to TS 23.502, 4.2.2.2.2, AMF sends Registration event to UDM
in the following cases:
- If the AMF has changed since the last Registration procedure, or
- if the UE provides a SUPI which doesn't refer to a valid context in
the AMF,
- or if the UE registers to the same AMF it has already registered
to a non- 3GPP access (i.e. the UE is registered over a non-3GPP access
and initiates this Registration procedure to add a 3GPP access).
In case that UE re-registers to the network with a GUTI, it bypasses
authentication check to the AUSF. In this case, AMF does not send
Registration event to UDM.
Consequently, when UE deregisters again, AMF would send a Deregistration
Event to a UDM, which does not have a context for it.
3GPP standard does not say when AMF sends Deregistration Event to UDM,
only that it is optional.
These (De-)Registration events are for (de-)registering AMF to the UDM
for serving the UE. And not for (de-)registering UE itself for purpose
of tracking when UE is registered on the network.
This partially reverts commit 7be7029ac4
Sukchan Lee
herlesupreeth
jmasterfunk84
Bostjan Meglic