New subject: CS Fallback in NextEPC

14 Jul 2019


      Hello Sukchan,
I already go out from the lab today, but Monday I will made this test that
you ask for.
Have a great day there.
Romeu Medeiros
Em sáb, 13 de jul de 2019 às 21:01, Sukchan Lee acetcom@gmail.com
escreveu:
...
Hi Romeu,
I'm really appreciate testing CSFB even though I have never been testing
this feature in the lab.
BTW, I have one question. If we want to remove Security-Related IE in UE
Context Modification Request,
I think NextEPC should not derive kENB in Extended Service Request handler.
Nevertheless, I've merged your pull request since it is properly worked at
first. ^^;
If your lab is available, could you test one more by removing the
following code?
In src/mme/emm-handler.c
586     if (SECURITY_CONTEXT_IS_VALID(mme_ue)) {
587         mme_kdf_enb(mme_ue->kasme, mme_ue->ul_count.i32, mme_ue->kenb);
588         mme_kdf_nh(mme_ue->kasme, mme_ue->kenb, mme_ue->nh);
589         mme_ue->nhcc = 1;
590     }
Just test it. If my expectation is true, I will fix all other things.
Thank you for your GREAT job!
Best regards,
    Sukchan
On Sun, Jul 14, 2019 at 8:04 AM Romeu Medeiros medeiros@medeiros.eng.br
wrote:
...
Hello Sukchan,
Now after remove this everything run correctly.
[image: image.png]
I will made the change more beatiful and pull the modification to the git
to you aprove.
Thanks
Romeu Medeiros
On Sat, Jul 13, 2019 at 6:50 PM Romeu Medeiros medeiros@medeiros.eng.br
wrote:
...
I found this in the 3GPP documentations [1]:
[image: image.png]
I will change the code to send only the CSFallback indicator in this
case to see if can solve the problem.
Thanks
Romeu Medeiros


https://www.etsi.org/deliver/etsi_ts/136400_136499/136413/09.10.00_60/ts_136...
On Sat, Jul 13, 2019 at 6:35 PM Romeu Medeiros medeiros@medeiros.eng.br
wrote:
...
Hello Sukchan and friends.
I'm trying to use the CSFB in test lab, and every time that nextepc
send the UEContextModificationRequest, the UE respond with an
UEContextModificationFaliure [ Protocol-cause=semantic-error ].
[image: image.png]
I'm looking why I'm getting this. Someone have any idea?
Thanks
Romeu Medeiros
On Thu, Jul 11, 2019 at 12:15 PM Sukchan Lee acetcom@gmail.com wrote:
...
Dear Osmocom & NextEPC Community,
Today I've added CS Fallback and released NextEPC v0.5.0
So, I'd just like to test this part with Osmocom project, but it seems
to be a difficult task. The reason is why I have little knowledge about
2G/3G. Nevertheless, I will try to do it
BTW, I don't know if there is anyone who wants to integrate this big
thing.
Even though I'm not sure if this will help, but let me introduce the
configuration of the NextEPC.
To use SGsAP, change the mme.conf as follows:
#
#  <sgsap>
#
#  o Single MSC/VLR
#    sgsap:
#      addr: 127.0.0.2
#      plmn_id:
#        mcc: 001
#        mnc: 01
#      tac: 4130
#      lac: 43690
#
#  o Multiple MSC/VLR
#    sgsap:
#      - addr: 127.0.0.2
#        plmn_id:
#          mcc: 001
#          mnc: 01
#        tac: 4131
#        lac: 43692
#      - addr
#         - 127.0.0.3
#         - fe80::2%lo0
#        plmn_id:
#          mcc: 001
#          mnc: 01
#        tac: 4132
#        lac: 43692
#      - name: msc.open5gs.org
#        plmn_id:
#          mcc: 001
#          mnc: 01
#        tac: 4133
#        lac: 43693
#
FYI, I also attach the pcap that I run with nextepc simulator as below.
$ ./tests/testcsfb
mo-idle-test        : SUCCESS
mt-idle-test        : SUCCESS
mo-active-test      : SUCCESS
mt-active-test      : SUCCESS
All tests passed.
Feel free to raise any questions about this things.
Best Regards,
    Sukchan

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