osmo-bts-trx + osmo-trx: dummy burst filling

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Harald Welte laforge at osmocom.org
Sat Aug 1 16:40:53 UTC 2020


Hi Vadim,

On Sat, Aug 01, 2020 at 11:28:30PM +0700, Vadim Yanitskiy wrote:
> While working on this, I stumbled upon the burst filling feature in osmo-trx
> [4], that is disabled by default.  If enabled, osmo-trx would be sending
> dummy bursts itself, so there is no need to send them from osmo-bts-trx, and
> thus no need to complicate the burst distribution logic.
> 
> I am now wondering why don't we enable this feature by default?

No idea, sorry.

> From the VTY reference:
> 
> > Send a dummy burst when there is nothing to send on C0 (TRX0) and
> > empty burst on other channels.  Use for OpenBTS compatibility only,
> > don’t use with OsmoBTS as it breaks encryption.
> 
> it's unclear how sending dummy bursts would break encryption...

I also cannot follow that argument.

Alexander Chemeris added this VTY text in 2019 in I752eb2c1162d084e8769181f2fcd6c0877663448,
he should know?

-- 
- Harald Welte <laforge at osmocom.org>            http://laforge.gnumonks.org/
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