[srslte-users] RRC_STATE_RELEASE_REQUEST if UE is not used for around 6 seconds

[Ismael Gomez]

Hi Kewin,

This is normal behaviour. The UE should automatically reconnect whenever
there is some traffic request from the UE or from the network (through
paging). You can also extend the timeout in enb.conf, option
expert.rrc_inactivity_timer

Regards
Ismael

On Wed, 11 Oct 2017 at 09:24 Kewin Rausch <krausch at fbk.eu> wrote:

> Hi srsLTE,
>
> first, I updated and tested the new release of srsLTE, and seems to behave
> better than the previous version. I can achieve now full speed on DL and UL
> with 25 PRBs, and the signal and data transmission is pretty stable.
>
> Great job!
>
> I also noticed a nasty behavior: If I don't use the UE connected to srsenb
> for more than about 6 seconds, the RRC layer request a release. I found the
> trace in the log which says:
>
>
>> 03:09:56.154342 [RRC ] Warning User rnti=0x46 expired Activity deadline:
>> 10:8875>10:0 us
>
>
> It seems that if data traffic does not flow for more than a certain
> timeout, the eNB automatically request a RELEASE to the core network. If I
> perform a speed test or navigate through the internet then the connection
> stays up and everything behaves smoothly.
>
> See srsenb/src/upper/rrc.cc, procedure rrc::ue::is_timeout() (should be
> around line 791).
>
> Cheers,
> Kewin R.​
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