Beacons contain the channel ID in the beacon frame.
STAs 'know' what channel they are 'on', and can discard beacons from adjacent channels.
On Monday, October 13, 2003, at 10:56 PM, Puneet B wrote:
Hi,
Actually, we've noticed that at least one vendor transmits beacons on adjacent channels to reduce the probe times. The idea is that the STA probes or listens to channel N and sees a beacon for channel N+1. No need to probe or listen on channel N+1 now.
What you mean by "a beacon for channel N+1". The AP is configured for channel N+1 and the STA probes for channel N right? Now if the AP sends a beacon on channel N, how does the STA know that it needs to associate on channel N+1?
One other possibility is that the receiver is near to a very high powered AP and there is enough energy in the signal to recover it far from its transmitted channel. This can be easily demonstrated with a Cisco 1200 AP, transmitting at full power (100mW) on channel 6. Within about 20 feet, the Beacons from this AP can be correctly received on all 11 802.11b channels.
This is again an interesting concept. Is this the case with all vendors?
I guess with some of the 200mW APs it'll be more noticeable? How do
STAs handle this? They get a beacon on channel 11 for an AP that is
configured for channel 6. Can they associate on and start using channel 11?
Puneet
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