CS Fallback in NextEPC

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Rafael Diniz rafael at rhizomatica.org
Mon Aug 5 19:42:28 UTC 2019


Thanks a lot Sukchan,

I'll test this week!

Rafael Diniz

On 8/2/19 7:05 PM, Sukchan Lee wrote:
> Hi Rafael,
>
> In the NextEPC, there are two ways to specify peers. 'addr' sets the
> IP address, and 'name' sets the hostname.
> So, if your network is configured to look up the VLR as a hostname,
> you can use 'name'.
>
> 'port' was just made for testing. If you want to use a different port
> without using standard 29118, you can put  'port' number.
>
> By the way, I've changed how to configure CS Fallback & SMS as below.
>
> #  o Single MSC/VLR(127.0.0.2)
>     sgsap:
>       addr: 127.0.0.2
>       map:
>         tai:
>           plmn_id:
>             mcc: 001
>             mnc: 01
>           tac: 4130
>         lai:
>           plmn_id:
>             mcc: 001
>             mnc: 01
>           lac: 43690
>       map:
>         tai:
>           plmn_id:
>             mcc: 002
>             mnc: 02
>           tac: 4132
>         lai:
>           plmn_id:
>             mcc: 002
>             mnc: 02
>           lac: 43692
>
> #  o Multiple MSC/VLR
>     sgsap:
>       - addr: 127.0.0.2
>         port: 29119
>         map:
>           tai:
>             plmn_id:
>               mcc: 001
>               mnc: 01
>             tac: 4131
>           lai:
>             plmn_id:
>               mcc: 001
>               mnc: 01
>             lac: 43691
>         map:
>           tai:
>             plmn_id:
>               mcc: 002
>               mnc: 02
>             tac: 4132
>           lai:
>             plmn_id:
>               mcc: 002
>               mnc: 02
>             lac: 43692
>       - addr
>          - 127.0.0.3
>          - fe80::2%lo
>         map:
>           tai:
>             plmn_id:
>               mcc: 001
>               mnc: 01
>             tac: 4132
>           lai:
>             plmn_id:
>               mcc: 002
>               mnc: 02
>             lac: 43692
>       - name: msc.open5gs.org <http://msc.open5gs.org>
>         map:
>           tai:
>             plmn_id:
>               mcc: 001
>               mnc: 01
>             tac: 4133
>           lai:
>             plmn_id:
>               mcc: 002
>               mnc: 02
>             lac: 43693
>
> Thanks a lot!
>
> Best Regards,
>     Sukchan
>
>
>
>
> On Sat, Aug 3, 2019 at 6:45 AM Rafael Diniz <rafael at rhizomatica.org
> <mailto:rafael at rhizomatica.org>> wrote:
>
>     Hi all,
>
>     Just a small question - what is the meaning of the "name" field in the
>     sgsap configuration?
>
>     Thanks,
>     Rafael Diniz
>
>     On 7/19/19 5:51 PM, Rafael Diniz wrote:
>     > Obrigado Romeu!
>     >
>     > On 7/19/19 4:58 PM, Romeu Medeiros wrote:
>     >> Hello Rafael
>     >>
>     >> I just configure the NextEPC to connect via SGS to OSMO-MSC,
>     like this:
>     >>
>     >>     sgsap:
>     >>         addr: 127.0.0.1
>     >>         port: 29118
>     >>         name: vlr.example.net <http://vlr.example.net>
>     <http://vlr.example.net>
>     >>         tai:
>     >>            plmn_id:
>     >>              mcc: 724
>     >>              mnc: 21
>     >>            tac: 12345
>     >>         lai:
>     >>            plmn_id:
>     >>              mcc: 724
>     >>              mnc: 4
>     >>            lac: 51544
>     >>
>     >> And the configuration in the MSC:
>     >>
>     >> sgs
>     >>  local-port 29118
>     >>  local-ip 0.0.0.0
>     >>  vlr-name vlr.example.net <http://vlr.example.net>
>     <http://vlr.example.net>
>     >>
>     >> And configure the IMSI in the Osmo-HLR and NextEPC-HSS
>     >>
>     >> If you need more help tell me.
>     >>
>     >>
>     >> Thanks
>     >>
>     >> Romeu Medeiros
>     >>
>     >>
>     >> And 
>     >>
>     >> On Fri, Jul 19, 2019 at 1:31 PM Rafael Diniz
>     <rafael at rhizomatica.org <mailto:rafael at rhizomatica.org>
>     >> <mailto:rafael at rhizomatica.org
>     <mailto:rafael at rhizomatica.org>>> wrote:
>     >>
>     >>     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>
>     >>     <mailto:acetcom at gmail.com <mailto:acetcom at gmail.com>>
>     >>     > <mailto:acetcom at gmail.com <mailto:acetcom at gmail.com>
>     <mailto: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> <http://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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