WLAN Probe Request Frame
The WLAN clients or stations use probe request frame to scan the area for availability of WLAN network. Following fig-1 mentions fields carried by the probe request frame.
As mentioned in the figure, there are two important fields viz. SSID and supported rates. Stations receiving these probe request frames need to decide whether the senders of probe request can join the network or not.
In order to have successful probe requests, stations transmitting them should have rates supported by the network which they wish to join. Hence SSID of the network should be included in the probe request frame.
WLAN Probe Response Frame
In response to the received probe request, network sends out probe response frame when parameters are compatible. Fig-2 mentions all the fields carried by WLAN probe response frame. Pls. note that some of the fields are exclusive to physical layer in use as mentioned in the beacon frame.
Probe response frames do not use TIM information element as stations sending out probes are not associated yet. The WLAN client or Station which has transmitted last beacon frame is responsible to respond for the incoming probe requests.
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