How the Access Point distinguishe the client's CW??

Hi all
according to the figur i attached, we know that when a wireless client want to send traffic to the AP (in upstream direction), this client must select back-off time between 0 and CWmin. the Client's CWmin is given by the AP via the beacon frame.
Now if we have 3 clients as shown in the figure, and they want to send different traffic, how AP distinguishe which station want to send voice, which station want to send data and which station want to send video.??? on another meaning, does the AP give all clients the same CWmin in order for them to transmit traffic to the AP???
Please help
Thank you

Naoufl:
You can not have different type of services on same WLAN. Each WLAN will have it's own services.
There should be one WLAN for data, one separate WLAN for voice and a third one for Video.
When a client tries to connect to data WLAN it uses data CW timers. the same for the others.
Clients connected to same WLAN can not use different CW timers. They will always use same timers if they are connected to same WLAN.
This is why you need to separate different services under different WLANs.
Hope this is helping.
Amjad

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