lchan broken unusable activation timeout

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Holger Freyther holger at freyther.de
Wed Aug 17 21:35:44 UTC 2016


> On 17 Aug 2016, at 22:27, Keith <keith at rhizomatica.org> wrote:
> 
> 
> 
> On 17/08/2016 21:43, Holger Freyther wrote:
>> Maybe not the version of osmo-bts you run but I think later versions
>> mark channels as broken as well (e.g. if the DSP did something odd).
>> *If* the channel release ack (or activation) is just delayed it should clean-up properly if "type sysmobts" is set in the config.
> type sysmobts is set in the config.
> Unfortunately, in a new installation
> (https://twitter.com/ninalakhani/status/765250788046143488) with a wifi
> link of some 3 KM or so
> we are ending up with this kind of situation after a short time:
> 
> OpenBSC# show lchan su
> BTS 0, TRX 0, Timeslot 1, Lchan 0, Type NONE - L1 MS Power: 33 dBm

type none? What OpenBSC version is that? So just the none already looks broken.


> Can I ask, What triggers the eventual calling of
> rsl_rx_rf_chan_rel_ack(), (I tried to trace it back but get a bit lost.)
> I do not understand the logic, as it would seem that once the REL ACK is
> lost, then it is lost, right?
> It would seem that something in openBSC needs to check for broken
> channels and release them. But then.. my understanding here is limited.


the actual arrival of the REL_ACK message.

holger


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