CS Fallback in NextEPC

Romeu Medeiros medeiros at medeiros.eng.br
Sun Jul 14 00:03:26 UTC 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 at 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 at 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 at 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
>>>
>>> 1.
>>> https://www.etsi.org/deliver/etsi_ts/136400_136499/136413/09.10.00_60/ts_136413v091000p.pdf
>>>
>>> On Sat, Jul 13, 2019 at 6:35 PM Romeu Medeiros <medeiros at 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 at 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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