CalypsoBTS and modern OsmoBSC

Anton Gorbachev antgorka at gmail.com
Tue May 9 20:20:45 UTC 2017


Hi Vadim!

Thank you for the comments. I will check your advices. Actually I already
watched everything on youtube and other resources☺ But it needs more time
to perceive all the info correctly...

9 Май 2017 г. 20:44 пользователь "Vadim Yanitskiy" <axilirator at gmail.com>
написал:

> Hi,
>
> > I found that the manual from the main site is outdated.
>
> Yeah, still couldn't find some time to update the wiki.
>
> > If I understood it correct, I have to setup calypso bts
> > as bts of type nanoBTS, correct?
>
> Why do you think so? No, CalypsoBTS has nothing related
> toip.access nanoBTS. From the other side, we don't have
> a dedicated type for OsmoBTS, so you can use 'sysmoBTS'.
>
> > I can sync with commercial cell, I can run OsmoBSC and
> > OsmoBTS but I still cannot find my network from my personal
> > phone in searching mode.
>
> Please watch a great Sylvain's talk, where he explained
> almost everything you need to know:
>
> "Further hacks on the Calypso platform"
> https://media.ccc.de/v/29c3-5226-en-further_hacks_calypso_h264
>
> In short: BTS should transmit a continuous beacon on C0 to be
> detected. Normal MS can't do that. CalypsoBTS was hacked to
> perform the following timeslot layout: Tt_R_ttt, where
> 'T' means TX on Downlink, 'R' means RX on Uplink, and 't' means
> channel filling - dummy bursts. Phone cannot RX and TX at the
> same time, so one phone serves only one TS. With two phones
> you have the following layout: TT_RRttt, so you have two
> timeslots served.
>
> This is why you will have some detection troubles even with
> working BSS setup :/
>
> > In logs of osmo-bts I can see:
> >
> > <0000> rsl.c:246 Tx RSL RF RESource INDication
> > <000b> trx_if.c:397 transceiver (phy0.0) rejected TRX command with
> > response: 'RSP SETTSC -1'
> > <0000> rsl.c:2353 (bts=0,trx=0,ts=0,ss=0) Rx RSL BCCH_INFO
>
> Just delete the 'settsc' line from your config, because CalypsoBTS
> transceiver only supports 'setbsic'.
>
> Have a fun!
>
>
> With best regards,
> Vadim Yanitskiy.
>
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