Phone acting as a BTS

[Alexander Chemeris]

Hi Harald, Sylvain,

On Wed, Feb 24, 2010 at 09:25, Harald Welte <laforge at gnumonks.org> wrote:
>> TS0 - Capture FCCH of a nearby station to calibrate local vcxo
>> TS1 - Our BTS TS0 TX
>> TS2 - Our BTS TS1 TX
>> TS3 - Our BTS TS2 TX
>> TS4 - Our BTS TS0 RX
>> TS5 - Our BTS TS1 RX
>> TS6 - Our BTS TS2 RX
>> TS7 - nothing ...
>
> Interesting idea, but I doubt it would work all that well.  A C0 of a BTS is
> required to transmit continuously on all timeslots.  The first step when
> scanning for BTS's is a power scan.  So if a MS does a power scan, it might
> do that at a time when your poor-mans-BTS is not transmitting and thus not find
> it.
>
> There might be other reasons why a MS is having problems with a
> 'discontinuously trasmitting' C0 of a BTS, as it is required by the spec.

But I guess you can use two MSs, one for transmit and one for receive to
overcome this limitation. Is there any problems with this approach other
then good clock synchronization?

PS Looking at pictures of ip.access Nanostation we didn't find any duplexers.
How does it work then? Or have we just missed duplexers on the photos?

-- 
Regards,
Alexander Chemeris.