Method for power save mode operation in wireless local area network and apparatus for the same

A wireless apparatus comprising:

• a transceiver for transmitting and receiving a radio signal;
• and
• a processor operably coupled to the transceiver, wherein the processor is configured for:
• transmitting a traffic indication map (TIM) element that announces existence of buffered traffic, wherein the TIM element includes an association ID (AID) assigned to a buffered STA having the buffered traffic when the buffered station (STA) is associated with the AP;
• receiving a poll frame for requesting data frame transmission from a candidate STA, wherein the poll frame contains an AID of the candidate STA and a medium access control (MAC) address which is a unique identifying information of the candidate STA;
• and
• determining whether the candidate STA is the buffered STA on the basis of the AID and the MAC address of the candidate STA.

A method for a power save mode operation in a wireless local area network (WLAN) system, the method comprising:

• receiving, by a station (STA), a traffic indication map (TIM) element that announces existence of buffered traffic, wherein the TIM element includes an association ID (AID) assigned to a buffered STA having the buffered traffic when the buffered STA is associated with an access point (AP);
• if an AID of the STA is equal to the AID of the TIM element, transmitting, by the STA, a poll frame to the AP in response to the TIM element;
• and
• if the STA fails to receive any frame from the AP within a predetermined timeout interval after transmitting the poll frame, operating, by the STA, by transitioning to a doze state.