CS Fallback in NextEPC

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Rafael Diniz rafael at rhizomatica.org
Fri Aug 2 21:45:01 UTC 2019


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>
>>         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>
>>
>> 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>> 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>>> 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>
>>     >     #        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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