Phone acting as a BTS

[Nordin]

I have once opened a nanoBTS and I remember that on one side is the 
receiver and the other side is the transmitter. So it's not like there 
is a duplexer, if you mean that as  a switch for RX/TX (like in MSs).


Alexander Chemeris schreef:
> 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. Â A C0 of a BTS is
>> required to transmit continuously on all timeslots. Â The first step when
>> scanning for BTS's is a power scan. Â 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?
>
>