[srslte-users] question on epc, ue and epc startup order

[Ismael Gomez]

Hi joe, I think the order must be epc, enb and ue.

On Thu, 12 Apr 2018 at 17:00 J Giovatto <jgiovatto at adjacentlink.com> wrote:

> Hi folks,
>
> I have a question about startup order w/r to ue, enb and epc.
>
> In our tests ue, enb and epc may be mobile and thus may not always be
> within reach at any given time.
>
> This is all related to running in emulation mode (streaming rf samples)
> so my results may be differ than the norm but here is what I see ...
>
> With the following startup sequence I can see the ue attach within a few
> seconds as expected.
>
> 1) epc + short pause < 2 sec
>
> 2) enb + short pause < 2 sec
>
> 3) ue  + short pause  < 2 sec
>
> Random Access Transmission: seq=1, ra-rnti=0x2
> RRC Connected
> Random Access Complete.     c-rnti=0x47, ta=0
> Network attach successful. IP: 172.16.0.2
> Software Radio Systems LTE (srsLTE)
>
> But with this sequence below I never see a ue attach log ...
>
> 1) enb + short pause < 2 sec
>
> I see the enb retry every 10 sec log
>
> Failed to connect to MME - retrying in 10 seconds
> Failed to connect to MME - retrying in 10 seconds
> Failed to connect to MME - retrying in 10 seconds
>
> 2) ue    + long pause ~ 30 sec
>
> Random Access Transmission: seq=1, ra-rnti=0x2
> RRC Connected
> Random Access Complete.     c-rnti=0x46, ta=0
>
> 3) epc
>
>
> 10:54:06.870503 [S1AP] [I] Received S1AP msg. Size: 49
> 10:54:06.870658 [S1AP] [I] Received initiating PDU
> 10:54:06.870687 [S1AP] [I] Received S1 Setup Request.
> Received S1 Setup Request.
> S1 Setup Request - eNB Name: srsenb01, eNB id: 0x19b
> 10:54:06.870719 [S1AP] [I] S1 Setup Request - eNB Name: srsenb01, eNB
> id: 0x19b
> 10:54:06.870735 [S1AP] [I] S1 Setup Request - MCC:001, MNC:01, PLMN: 61712
> S1 Setup Request - MCC:001, MNC:01, PLMN: 61712
> 10:54:06.870752 [S1AP] [I] S1 Setup Request - TAC 7, B-PLMN 0
> S1 Setup Request - TAC 7, B-PLMN 0
> S1 Setup Request - Paging DRX 2
> 10:54:06.870773 [S1AP] [I] Adding new eNB context. eNB ID 411
> Sending S1 Setup Response
> 10:54:06.871967 [S1AP] [I] Sending S1 Setup Response
> 10:54:06.872066 [S1AP] [D] Waiting for SCTP Msg
>
> If I restart the ue then the attach is successful.
>
> logs available on request.
>
> Regards
>
> Joe
>
>
>
>
>
>
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>
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