[srslte-users] srsenb disconnection problem

[Kewin Rausch]

Hi everyone,

I had a similar issue (dunno if it's really the same), and I partially
resolved it by following Ismael answer and increasing the inactivity
timeout period (now I set it at 60 seconds).
Basically If i leave the UE connected to 4G but I do not generate traffic
(for about the time the inactivity timeout value), it get disconnected by
the eNB.

This is not happening while I'm connected to a commercial base station,
which means that something nasty is happening, and maybe paging is not
correctly handled.

I've tried the configuration with a Nexus 5, and once it get disconnected I
need to reset everything by switching on and off the Airplane mode.

Cheers,
Kewin

On Fri, Oct 27, 2017 at 8:35 AM, Ismael Gomez <
ismael.gomez at softwareradiosystems.com> wrote:

> Hi nicola, can you send us the enb.log? It is normal behavior to release
> the connection after inactivity. You can extend the timeout in the enb.conf
> file, expert section.
>
> However the UE should reconnect when paging is received when you ping it
> for instance. If you send me the log I can check it.
>
> Regards
>
> El jue., 26 oct. 2017 17:27, Nicola Bui <n.bui at northeastern.edu> escribió:
>
>> Dear all,
>>
>> I am running srsenb using oai as EPC. My mobile phone (moto g5+) connects
>> to the network and for a while behave normally (ping is ok, surfing is ok,
>> speedtest is fine). However, after some time everything stops working even
>> though the phone still has an IP address the enb says the UE is attached
>> (c-RNTI assigned properly).
>> Actually, in the enb log I can see the c-RNTI got released and a new one
>> got assigned to the UE, but the new connection is not working anymore. The
>> only way for recovering the connectivity is from the mobile toggling on and
>> off the airplane mode.
>> The only error message I can see is: Unhandled feature in RRC function:
>> liblte_rrc_unpck_rrc_connection_setup_complete
>> However this appears even when the connection has been properly setup.
>>
>> It will be great if I can get a more stable connection or if the
>> connection can be automatically reestablished.
>> Any suggestion on how to debug this?
>>
>> Thanks,
>> Nicola Bui
>> Senior Research Scientist
>> College of Computer and Information Science
>> 655E Interdisciplinary Science and Engineering Complex
>> Boston, MA 02115
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>>
>
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