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

[Kewin Rausch]

Hi Ismael,

The UE should automatically reconnect whenever there is some traffic
> request from the UE or from the network (through paging).


My Nexus does not disconnects from 4G when I'm attached to my operator
cell, even If I'm not transmitting/receiving any data.
With such disconnection I see the antenna icon going completely empty (no
4G symbol, empty triangle).

I will try to set that option with a longer period.

Cheers,
Kewin R.


On Wed, Oct 11, 2017 at 9:56 AM, Ismael Gomez <
ismael.gomez at softwareradiosystems.com> wrote:

> 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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>> srslte-users at lists.softwareradiosystems.com
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>>
>
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