Sameness in Scan Results

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On Thu, 2011-04-28 at 14:15 -0600, Caleb Phillips wrote:
> Thanks for your response, Dan...
> 
> >> I've searched the mailing list and bugzilla without avail, for what
> >> seems like a very obvious problem. Whenever I do a scan, wide or normal,
> >> the scan results all return with an identical RSSI and SNR. This
> >> behavior can even be seen in the documentation for 1.5.2:
> >
> > That's because the same exact tower and radios broadcast the IDs for
> > each of these networks.  CLEAR is the actual provider, but the other 3
> > are simply "virtual operators" or really "Network Service Providers"
> > while Clear provides the towers.  So it's no wonder that they all look
> > exactly the same except for the ID: because they are all coming from the
> > same exact radios at the base station.
> >
> > If there was more than one WiMAX provider in your area (not just CLEAR
> > and 3 others reselling CLEAR under their own name) then you'd see
> > different results.
> 
> At my site on the University of Colorado, I have at least 3 distinct 
> BSes on different buildings and operating at different center 
> frequencies, so it stands to reason they would have different CINR/RSSI 
> stats. I also see other operators, such as CLEAR and SPRINT networks in 
> my area and those show up with the same RSSI/CINR as well.

The middleware will pick up one and present just that one -- probably
the highest ones. So unless there is an specific BS <->NSP mapping,
where each NSP is being serviced by a different basestation, you
wouldn't see it.

> I'd be happy to reproduce this and share debug information if you let me 
> know what would be useful to see (I reckon the output of wimaxcu scan 
> wide isn't helpful).
> 
>  >> I'm a researcher at the
> >> University of Colorado and am hoping to use the driver in a measurement
> >> platform. So, what I'd really like is more detailed scan results (per
> >> station frequency, bsid, CINR, RSSI, etc.). I've tried to determine if
> >> this information exists somewhere but as far as I can tell, what's in
> >> wimaxd.log is probably my best bet (without substantial, and deep
> >> modifications to the driver)?
> 
> Any thoughts on my second question, w/r/t how to get more detailed 
> per-BS performance stats from the scan results?

nope, only what the CommonAPI provides, which I agree, is very general.




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