* Add Diameter Dictionary Elements
* Initial IDR Framework
* Resolve Compile Issues
* Moving Closer
* Compile error
* Somewhat Working stuffing Code
* Add Timestamp Changes
* Cleanup some of this code. mme_s6a_handle_idr in s6a-handler.c removed for now, since it will only come in handy when IDR flag is set to request current location, which would involve breaking out into paging. I think there's a few other things we can do just within fd-path first.
* further removal of mme_s6a_handle_idr
The problem occurred in the following scenario:
1. VLR sent PAGING-REQUEST to the MME
2. MME sent S1-Paging to the UE
3. Paging failed
4. MME responded SERVICE-REQUEST to the VLR
5. VLR sent DOWNLINK-UNITDATA to the MME
6. Even though there is no S1 Context,
MME try to sent DownlinkNASTransport message to the UE.
7. So, the problem occurred.
I've changed the number 4 PAGING-REJECT instead of SERVICE-REQUEST.
- 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
The network access mode of HSS has been changed to 0 (Packet and Circuit).
Versions of MME prior to v2.4.2 did not use this value. Open5GS set
the attach result of Attach Complete message as it is by looking
at the attach type of the Attach Request message.
Now, if the network access mode of HSS is set to 2 (Only Packet),
this value is affected by MME from v2.4.3. Regardless of the attach type
of the Attach Request, the MME will set EPS Only to the attach result
of Attach Complete.
An assert occurs when a NAS message retransmission occurs.
Because there is no `enb_ue` context.
Therefore, before removing enb_ue, all Timers must be stopped
to prevent retransmission of NAS messages.
The AMF shall assign a new 5G-GUTI for a particular UE:
a) during a successful initial registration procedure;
b) during a successful registration procedure
for mobility registration update; and
c) after a successful service request procedure invoked as a response
to a paging request from the network and before the release
of the N1 NAS signalling connection as specified in subclause 5.4.4.1.
The AMF should assign a new 5G-GUTI for a particular UE
during a successful registration procedure
for periodic registration update. The AMF may assign a new 5G-GUTI
at any time for a particular UE by performing
the generic UE configuration update procedure.
If both Delete-Session-Request/Response and
UEContextReleaseCommand/UEContextReleaseComplete are failed at the same time,
UE cannot attach to the EPC infinitely.
So, I've add the protection code
if timer expires when MME does not receive Delete-Session-Response.
Most of the time, an application wants to perform some amount of data buffering
in addition to just responding to events. When we want to write data,
for example, the usual pattern runs something like:
1. Decide that we want to write some data to a connection;
put that data in a buffer.
2. Wait for the connection to become writable
3. Write as much of the data as we can
4. Remember how much we wrote, and if we still have more data to write,
wait for the connection to become writable again.
Now, Open5GS implements the above method by default when transmitting data
in a stream type socket.
So far, no operation was performed when Error Indication was received
from eNodeB. For that reason, I solved #568 issues by controlling
the MME to prevent this from happening.
Now, when GTP-U Error Indication is received, MME and SGW are implemented
to do what they have to do. I hope that the network can be restored
by responding appropriately even if Error Indication occurs.
In TS24.501 Ch 5.5.1.3.8 Abnormal cases on the network side
d) REGISTRATION REQUEST with 5GS registration type IE set to
"mobility registration updating" or "periodic registration updating"
received after the REGISTRATION ACCEPT message has been sent and
before the REGISTRATION COMPLETE message is received.
Since, we have to do this special case, it is desirable
to handle it directly inside the state(gmm-sm.c).
- 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
* MME: select SGW by RR,TAC,ENB_ID
and enable round robin inside each option
* SMF: select PFCP associated UPF by RR,TAC,APN,ENB_ID
and enable round robin inside each option
jmasterfunk84
Sukchan Lee
Bostjan Meglic
Carlos Giraldo
Kenny Barlee