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

[J Giovatto]

OK Thanks,

So what we have seen is that any UE makes an attach request within the
10 enb to mme retry period also fails to attach.

Joe




On 04/13/2018 05:10 AM, Ismael Gomez wrote:
> 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
> <mailto: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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