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

[Andre Puschmann]

Hi David,

besides of what Pedro said, you can also try 18.12 and apply [1] to it.
It would be good to know if the IPhone finds the network then and attaches.

This iPhone XR has the Intel baseband, right?

Thanks
Andre



[1]
https://github.com/srsLTE/srsLTE/pull/308/commits/d4efd448b8c7d8ff2234dca2ec80c9796534f76e

On 15/2/19 15:07, Pedro Alvarez wrote:
> 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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