Re: [Openbts-announce] openbts

[David A. B. <dbu...@jc...>]

Iwan -

To answer you question about real time:  GSM is real time in L1, but  
in L2 and L3 things are much more relaxed.  Everything above L1 is  
queue-driven, not clock-driven.  We use a non-standard USRP firmware  
release that timestamps the RF sample packets and that's how we  
insure proper radio sync in L1.  Given that feature, we don't really  
need a real time OS.  We just make sure that the radio interface has  
preference in the scheduler (nice -10, for example) and everything  
else takes care of itself.

So what's cellular coverage like in rural Indonesia?

-- David

On Sep 8, 2008, at 11:23 AM, Iwan BK wrote:

> 2 Years experience in WIMAX MAC Layer Development.
> sourceforge ID : iwanbk
>
> I have some question, is GSM don't need realtime timing constraint ?
> As far as i can see from source code & info on the web. openbts  
> don't use realtime OS nor even consider about realtime.
>
> Your project seems very exciting to me, as i come from developing  
> world, Indonesia.
>
> Thx.
>
> -- 
> Iwan Budi Kusnanto


David A. Burgess
Kestrel Signal Processing, Inc.