Method for changing association ID in wireless communication system and apparatus therefor
The present invention discloses a method for changing an association ID in a wireless communication system and an apparatus therefor. Specifically, a method for changing an association identification (AID) of a first station (STA) communicating directly with a second STA in a wireless communication system comprises the steps of: receiving, from an access point (AP), a reassignment response frame containing new AID information to be newly allocated to the first STA; the first STA transmitting an update request frame containing the new AID information to the second STA; and as a response to the update request frame, receiving an update response frame from the second STA.
1. A method of changing association identification (AID) of a first station performing a direct communication with a second station in a wireless communication system, the method comprising:
transmitting, by the first station to an access point (AP), a switch request frame for requesting a new AID when a traffic pattern of the first station changes,
wherein a group consisting of stations having a same listen interval is distinguished by the AID,
wherein a listen interval of the first station and a group, to which the first station is associated, are changed when the traffic pattern of the first station changes,
wherein the AID of the first station is updated based on the change in listen interval of the first station and the change in the group of the first station,
wherein the first station and the second station have an established direct link, and
wherein the direct link is established based on a tunneled direct link setup;
receiving, by the first station from the AP, a switch response frame containing new AID information which is newly assigned to the first station and the second station,
transmitting, by the first station, the new AID information included in the switch response frame to the second station; and
changing the AID of the first station and the second station using the received new AID information.
2. The method of claim 1 , further comprising the step of starting a timer by the first station when the switch response frame is received, wherein the first station uses both a new AID and an initial AID until the timer expires.
3. The method of claim 2 , wherein the first station communicates with the AP using either the new AID or the initial AID.
4. The method of claim 2 , wherein if the timer expires, the first station releases the initial AID.
5. The method of claim 1 , wherein the switch request frame includes a direct link setup information indicating a presence of the established direct link of the first station and second station.
6. The method of claim 5 , wherein the switch request frame further includes a direct link number information indicating the number of established direct link(s) of the first station.
7. The method of claim 1 , wherein the first station pauses a partial AID PHY filtering until receiving the update response frame from the second station.
8. A first station device for changing an association identification (AID) in the course of performing a direct communication with a second station, the first station comprising:
a transceiver that transmits and receives a wireless signal; and
a processor that controls the transceiver to transmit, to an access point (AP), a switch request frame for requesting a new AID when a traffic pattern of the first station changes,
wherein a group consisting of stations having a same listen interval is distinguished by the AID,
wherein a listen interval of the first station and a group, to which the first station is associated, are changed when the traffic pattern of the first station changes,
wherein the AID of the first station is updated based on the change in listen interval of the first station and the change in the group of the first station,
wherein the first station and the second station have an established direct link, and
wherein the direct link is established based on a tunneled direct link setup,
controls the transceiver to receive, from the AP, a switch response frame containing new AID information which is newly assigned to the first station and the second station when a traffic pattern of the first station changes,
controls the transceiver to transmit the new AID information included in the switch response frame to the second station, and
changes the AID of the first station and the second station using the received new AID information.