Beacon Interval ?

Robert Botha hostap at flash.za.org
Mon Oct 14 06:29:44 EDT 2002


Hi Jouni,

What's the size of this beacon, and how much bandwidth will it use up
with it's default setting. 
How much latency are we talking about (in ms)
Will this setting be usefull in PTP links (Ad-Hoc Mode)


Thanx,
-Robert.

On Sun, Oct 13, 2002 at 08:15:06AM +0300, Jouni Malinen wrote:
> On Sat, Oct 12, 2002 at 06:54:21PM -0700, Doug Bradford wrote:
> 
> > What should the beacon interval be set to. What is the default?
> 
> Default is 100, i.e., ten beacons per second. With Host AP mode, the
> most noticeable effect of beacon interval is latency in sending unicast
> packets to power saving stations and broadcast/multicast packets in
> general. I would set beacon interval depending on the environment where
> the AP is operating.
> 
> If you have many stations using power saving, you might want to keep the
> beacon interval quite small since larger interval adds latency to
> AP->STA packets. Even without any stations using PS, Host AP mode seems
> to often wait for next DTIM beacon frame before sending pending
> broadcast/multicast frames. This might be an issue in some cases. On the
> other hand, every beacon frame take a small portion of the maximum
> bandwidth and using a larger beacon interval would save some bandwidth
> for data frames. So, this will be a compromise between enlarged latency
> and saved bandwidth. I would suggest experimenting with different values
> since there is not really any one-value-fits-all solution for this.
> 
> -- 
> Jouni Malinen                                            PGP id EFC895FA
> 
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> 

-- 
Robert Botha
jabber: flash at vitalclan.co.za




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