[srslte-users] iPhone XR reconfiguration error with srsLTE 18.09

[Pedro Alvarez]

Hi David,

I think this might be related to a bug in the EPC that got fixed in
the 18.12 version.
Can you either try the 18.12 version of the EPC or try to apply the
following patch?

"""
diff --git a/lib/src/asn1/liblte_mme.cc b/lib/src/asn1/liblte_mme.cc
index 5cb00e5..59a86d9 100644
--- a/lib/src/asn1/liblte_mme.cc
+++ b/lib/src/asn1/liblte_mme.cc
@@ -320,7 +320,7 @@ LIBLTE_ERROR_ENUM
liblte_mme_pack_mobile_id_ie(LIBLTE_MME_MOBILE_ID_STRUCT  *mob
             odd = false;
         }else if(LIBLTE_MME_MOBILE_ID_TYPE_TMSI == mobile_id->type_of_id){
             id32 = mobile_id->tmsi;
-            length = 4;
+            length = 5;
             odd = false;
         }
         }else{
"""

Regards,
Pedro

On Fri, Feb 15, 2019 at 10:13 AM David Rupprecht <david.rupprecht at rub.de> wrote:
>
> Dear all,
>
> I'm currently testing an iPhone XR with srsenb. I'm using version 18.09,
> because the iPhone XR does not find the cell with 18.12. It works well
> as it finds the cell, performs the authentication. However, the UE
> disconnects after the RRC Configuration Reconfiguration, performs a new
> RAP / RAR and tries to Reestablish the RRC connection with a
> RRCConnectionReestablishmentRequest, which includes the Reestablishment
> Cause is set to reconfigurationFailure. It looks like the
> reconfiguration fails. However, I use the default config, which works
> well with other phones. Do you have any hint were I can start testing?
>
> I have attached the pcaps and logs and the enb configs.
>
> Thank you very much and best regards,
> David
>
> --
> M.Sc. David Rupprecht
>
> Ruhr-University Bochum
> Research Group Information Security
> Universitätsstraße 150
> ID 2/130
> 44780 Bochum / Germany
>
> Phone: +49 234 / 32 - 23508
> Web: www.infsec.rub.de
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