Patent ID: 9615385
Date: 2017-04-04
CPC Classifications: H04W

Claim:
1. A method for transmitting a signal of an access point (AP) in a wireless communication system, the method comprising: receiving a power save (PS)-poll frame from a first station (STA); transmitting a second frame including a response to the PS-Poll frame to the first STA, wherein the second frame is either a first acknowledgement (ACK) frame or a request to send (RTS) frame, wherein the second frame includes an indicator requesting the first STA to transmit a third frame to allow second STA to set a network allocation vector (NAV), and wherein the second STA is an STA unable to sense the AP; receiving the third frame from the first STA, wherein the third frame is either a second ACK frame or a clear to send (CTS) frame; transmitting a data frame to the first STA, the data frame including downlink data; and receiving a third ACK frame which is a response to the downlink data from the first STA, wherein when the second frame is the RTS frame, the PS-Poll frame includes information indicating that a frame other than the first ACK frame will be transmitted after a short interface space (SIFS).