Patent ID: 9503976
Filing Date: 2016-11-22
CPC Classification: H04W,Y02D

Claim Text:
1. A method for receiving data in a wireless local area network system, the method performed by a station (STA) operating in a power save mode comprising: receiving, from an access point (AP), a beacon frame including a Traffic Indication Map (TIM) element, a group ID field, a transmit power field, and a channel access information field, wherein the group ID field indicates a STA group including a plurality of STAs, wherein the TIM element includes a TIM bitmap field indicating whether there is a buffered frame for at least one STA belonging to the STA group, wherein the transmit power field indicates a maximum transmit power assigned for the STA group, wherein the channel access information field indicates an access duration for the STA group; determining whether there is a buffered frame for the STA based on the TIM element and the group ID field; and transmitting a power save poll (PS-poll) frame to the AP during the access duration when there is a buffered frame for the STA according to the maximum transmit power.