Re: [BAWUG] One Slow User In The Hot Spot Can Degrade Wi-Fi Performance

[Cliff Skolnick]

In an environment with heavy use at any speed all client will start 
dropping speed if there are lots of collisions.  This makes sense as 
there is no real way to determine if you are getting interference from 
another station wanting to access the network or microwave oven.  This 
can be mediated by fortune if all clients can hear each other and 
decrease collisions because of that, or as Tim says locking the speed 
to higher rates.  It's not really the "slow user" that degrades - it's 
the fact that slow users are often far away or have crap radios and are 
hidden from most of the clients.

This is only an issue where the clients are sending lots of data,  if 
they are all just surfing the web by definitions collisions will be low 
since everyone is supposed to be able to hear the AP all the time and 
will not collide with the AP most of the time.  CTS/RTS can also help 
here theoretically, but I've not done the real world tests to verify 
this.  Has anyone done this?

Cheers,
Cliff
On Tuesday, Aug 5, 2003, at 13:16 US/Pacific, Tim Pozar wrote:

Interesting.  This has been discussed for some time now on this
list and on others.  A solution that was offered was to lock down
the AP to only higher modulation speeds.
Tim

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