I think I have asked about this before, so please forgive me, could do with a recap.
I’ve been reading a little about Bluetooth vs 802.11 WLAN coexistence. I read that there are various technologies that help the two to coexist happily, including firstly Adaptive Frequency Hopping, secondly extra signals from Bluetooth chips, that indicate when a radio in the current system is active transmitting (or receiving ? or active?) 802.11 data so as to allow Bluetooth to wait a mo and hold back avoiding garbling the WLAN signal, and probably other mechanisms too, I forget.
My questions then:
1. Given the availability of AFH, assuming everyone now has this, is it a very good thing to have a free 2.4 GHz 20MHz
channel, unused by any SSID? Is it worthwhile, or can things somehow work out well even if all 2.4 GHz channels are in use by WLANs?
2. If you are using channel 11, can Bluetooth use high channels > 13, channels that some WLAN users cannot exploit? If you use channel 11, with that centred on channel 11 (?) so its exploited band goes up to channel, what, 13 ? Is there any space left up there for Bluetooth to hop into, or is it all used ?
3. Same question for channel 13: If you use channel 13, if you
can - not sure about the rules for this - is there any space above this band at all?
4. What is the story regarding the possibility of using channel 13 ? Are there some country-specific rules about it ?
5. Anyone have experience from using all of channels 1 + 6 + 11 simultaneously ? (Or even 1+5+9+13 ?)