CS Fallback in NextEPC

Romeu Medeiros medeiros at medeiros.eng.br
Sat Jul 13 21:50:11 UTC 2019


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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