Method and apparatus for updating system information in wireless LAN system
The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for updating system information in a wireless LAN system. A method for a station (STA) to update system information in a wireless communication system according to one embodiment of the present invention comprises the steps of: if the value of a change sequence field received by the STA from an access point (AP) is different from the value of the change sequence field stored in the STA, transmitting, to the AP, a probe request frame including the change sequence field set to the value of the change sequence field stored in the STA; and a step of receiving, from the AP, a probe response frame responding to the probe request frame including the change sequence field.
1. A method for providing system information updates in an access point (AP) of a wireless communication system, the method comprising:
transmitting, by the AP, a beacon frame comprising a change sequence field to a station (STA),
wherein a value of the change sequence field increases when the AP determines at least one system information element is updated,
receiving a probe request frame from the STA when the value of the change sequence field in the beacon frame increases,
wherein the probe request frame includes a change sequence element, and
transmitting a probe response frame comprising at least one of a plurality of system information elements when the change sequence element in the probe request frame has a value that is different from the value of the change sequence field.
2. The method according to claim 1 , wherein the beacon frame corresponds to a short beacon frame transmitted by the AP.
3. The method according to claim 1 , wherein the STA acquires the value of the change sequence field prior to receiving the beacon frame from the AP.
4. The method according to claim 3 , wherein the value acquired by the STA is different from the increased value included in the beacon frame.
5. The method according to claim 1 , wherein the probe response frame further comprises the change sequence field set to an updated value.
6. The method according to claim 1 , wherein the AP does not receive the probe request frame comprising the change sequence field when the value of the change sequence field does not increase.
7. The method according to claim 1 , wherein the value of the change sequence field has a size of 1 octet and is set to a value of 0 to 255.
8. An access point (AP) apparatus for providing system information updates in a wireless communication system, the AP apparatus comprising:
a transceiver; and
a processor that controls the transceiver to:
transmit a beacon frame comprising a change sequence field to a station (STA),
wherein a value of the change sequence field increases when the AP determines at least one system information element is updated,
receive a probe request frame from the STA when the value of the change sequence field in the beacon frame increases,
wherein the probe request frame includes a change sequence element, and
transmit a probe response frame comprising at least one of a plurality of system information elements when the change sequence element in the probe request frame has a value that is different from the value of the change sequence field.