CS Fallback in NextEPC

Rafael Diniz rafael at rhizomatica.org
Fri Jul 19 16:29:59 UTC 2019


Hi all,

I'd also like to test SMS and CSFB in LTE. I have some experience with
the Osmocom GSM stack, but not much with the NextEPC LTE. Could you
point me which fields should I set in the configuration files?

Thanks,
Rafael Diniz

On 7/13/19 6:35 PM, Romeu Medeiros 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.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
> <mailto: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 <http://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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