WLAN Association Request frame
Once the WLAN client devices or mobile stations identified the compatible WLAN network and already authenticated with it, they will start attempting to join the same. This action performed by sending out association request frame.
Fig-1 mentions all the required fields carried by the WLAN Association request frame. All the fields are mandatory and order of the fields should be as mentioned.
Capability information field indicates type of network station wants to join with.
Before the AP accepts the association request frame received, it verifies following:
• Capability Information
• rates supported
If all the above fields match with the parameters of the WLAN network then only the frame will be accepted. AP also decodes the 'Listen Interval' field which indicates how often STATION listens to beacon frames in order to monitor TIM element.
WLAN Association Response frame
WLAN APs will reply association response frames after receiving association request frames from the mobile stations willing to join them(i.e. network). All the fields are mandatory. As part of the response, WLAN AP will assign Association ID. The different vendors will have different methods for the ID assignments.
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