Phone acting as a BTS

David A. Burgess dburgess at jcis.net
Wed Feb 24 07:59:39 CET 2010


Harald, Sylvain -

We have tried running OpenBTS in a half-duplex mode to see if we  
could remove the duplexer for really cheap applications, but it  
doesn't work very well.  Some handsets respond to it and others don't.

-- David


On Feb 23, 2010, at 7:25 PM, Harald Welte wrote:

>
> 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.
>
> David Burgess might know more about it.  Also, this behavior could be
> simulated with OpenBTS, just to see how phones react to it.
>
> But I'd say definitely worth a try...


David A. Burgess
Kestrel Signal Processing, Inc.







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