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Bluetooth co-existence

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MrSinatra

Occasional Visitor
i have an asus rt-ac66r

it has an option under the wireless settings professional tab for 2.4 band called bluetooth co-existence.

it has 3 settings:

enable
disable
pre-emptive

can someone explain what each one does, and specifically the difference between enable and preemptive?

thx.
 
A search has given this:
Code:
Bluetooth Coexistence
An 802.11 device and Bluetooth can interfere with each other when the 802.11 device operates on the 2.4 GHz band.
All Bluetooth devices operate at the 2.4 GHz band. If you experience wireless disconnects, decreased range or speed,
and other connectivity issues when you turn on some of your Bluetooth devices, try to change this option to "Enable"
(this will make the router and Bluetooth device to take turns in using the spectrum for communication) or "Preemption"
(the router will inform the Bluetooth device about the channel it is operating on, and the Bluetooth device can preemptively
disable communication on the respective Bluetooth channels).

Please note that this option requires your Bluetooth device to "cooperate". If the Bluetooth device doesn't implement
the coexistence techniques, using this option will have no effect. Experiments in late 2010 seemed to show that 
few devices support this feature.

https://wireless.wiki.kernel.org/en/users/documentation/bluetooth-coexistence#bluetooth_coexistence
 
i appreciate that but it doesn't really answer my question...

i don't understand the difference between the options, or if any of them work even if the bluetooth stuff isn't compatible. basically, i want to clear a lane for some sony rear surround speakers that use the S-AIR system, and i think thats roughly the same as bluetooth, if not the same, and 2.4 etc... and i am trying to figure out which option would work best, and how to determine that.

https://docs.sony.com/release/davhdx275.pdf

https://docs.sony.com/release/airsa10.pdf
 
Last edited:
i have an asus rt-ac66r

it has an option under the wireless settings professional tab for 2.4 band called bluetooth co-existence.

it has 3 settings:

enable
disable
pre-emptive

can someone explain what each one does, and specifically the difference between enable and preemptive?

thx.
In order to enhance the device in Bluetooth and wireless at the same time to open and transfer data.
To ensure that the wireless performance is not disturbed
 
i appreciate that but it doesn't really answer my question...

i don't understand the difference between the options, or if any of them work even if the bluetooth stuff isn't compatible. basically, i want to clear a lane for some sony rear surround speakers that use the S-AIR system, and i think thats roughly the same as bluetooth, if not the same, and 2.4 etc... and i am trying to figure out which option would work best, and how to determine that.

https://docs.sony.com/release/davhdx275.pdf

https://docs.sony.com/release/airsa10.pdf


Yes, I know I'm necro'ing an old thread, but since this was never answered properly......

Bluetooth Coexistence Preemptive is an optional parameter that allowed a BT device, if queried, to report back what BT channel it was on. The requesting device could then select an alternate BT channel.

BT Coexistence Enable instead attempted to share the same channels. I'm not clear on what method is implied by, as an example, DD-WRT. Here is a decent enough link to some of the "Enabled" possible methods.
https://www.ecnmag.com/article/2012/03/wi-fi-and-bluetooth-coexistence

Mind you I believe the most telling comment in that link is re: AFH and it's ability for BT to learn and avoid used spectrum independent of Wi-Fi attempts at cooperation.

From these links we can see that AFH become standard on BT V 1.2 and on.
https://www.marvell.com/wireless/assets/Marvell-WiFi-Bluetooth-Coexistence.pdf
https://honeywellaidc.force.com/sup...t-is-Bluetooth-Adaptive-Frequency-Hopping-AFH
http://www.mobileidsolutions.com/re...bluetooth-radio-performance_class-1-2_afp.pdf


Clearly AFH is now common used. Meanwhilw I can find no example of a BT product commenting on their implementation of BT Coexistence vis a vis "Enable" vs "Premptive".

My thinking? I don't think it can hurt to implement "Preemptive". I would not use "Enable" as it suspect it might degrade reliability/quality of the 2.4 Wi-Fi service. However, I've disabled it entirely on my Wi-Fi AP's.

Hope this helps others.

D
 

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