Method and device for updating system information in wireless LAN system

A method for providing system information updated in an access point (AP) of a wireless communication system, comprising:

• receiving, via the AP, a probe request frame, including a configuration change count field;
• and
• transmitting, via the AP, a probe response frame to a preferred STA,
• wherein if a value of the configuration change count field included in the probe request frame is different from a current count value of the AP, the probe response frame includes one or more elements of system information needed to be updated to the preferred STA,
• wherein a count value of the AP increases when a non-dynamic element of the system information is updated, and
• wherein the count value of the AP is associated with the value of the configuration change count field.

A station (STA) configured to update system information in a wireless communication system, comprising:

• a transceiver;
• and
• a processor,
• wherein the processor is configured to control the transceiver to transmit a probe request frame, including a configuration change count field, to a preferred AP and to receive a probe response frame from the preferred AP,
• wherein if a value of the configuration change count field included in the probe request frame is different from a current count value of the preferred AP, the probe response frame includes one or more elements of system information needed to be updated to the STA,
• wherein a count value of the preferred AP increases when a non-dynamic element of the system information is updated, and
• wherein the count value of the preferred AP is associated with the value of the configuration change count field.

An access point (AP) configured to provide updated system information in a wireless communication system, comprising:

• a transceiver;
• and
• a processor,
• wherein the processor is configured to control the transceiver to receive a probe request frame including a configuration change count field from a station (STA) and to transmit a probe response frame to the STA,
• wherein if a value of the configuration change count field included in the probe request frame is different from a current count value of the AP, the probe response frame includes one or more elements of system information needed to be updated to the STA,
• wherein a count value of the AP increases when a non-dynamic element of the system information is updated, and
• wherein the count value of the AP is associated with the value of the configuration change count field.