Method for transceiving data on basis of service period scheduling in wireless LAN system and apparatus for supporting same
Provided is a method for transceiving data in a wireless LAN system on the basis of station (STA)-based service period scheduling. The method comprises entering an awake state, configuring a service period for transceiving an access point (AP) and data, transceiving the AP and the data during the service period, and entering a doze state when the service period ends.
1. A method for scheduling a service period in a wireless LAN system, the method comprising:
receiving, at a first wireless station, a beacon frame including a traffic indication map (TIM) from an access point (AP);
if the TIM indicates that there is a buffered frame for the first wireless station, transmitting, at the first wireless station, a service period poll frame including a duration field of a polled service period, a basic service set identifier (BSSID) field, and a transmitter address (TA) field, wherein the BSSID field indicates an address of the AP, and the TA field indicates an address of the first wireless station, wherein the duration field indicates a time duration used for transmitting a buffered frame by the AP if the service period poll frame is received by the AP, wherein the duration field indicates a time duration used for a Network Allocation Vector (NAV) of a second wireless station that does not transmit the service period poll frame if the service period poll frame is received by the second wireless station;
in response to the service period poll frame, receiving, at the first wireless station, an ACK message from the AP; and
in response to the ACK message, entering, at the first wireless station, into a doze state.
2. The method of claim 1 , further comprising:
receiving, at the first wireless station, an indicator indicating an end of the service period; and
in response to the indicator, entering, at the first wireless station, into the doze state.
3. A first wireless station comprising:
a transceiver transmitting and receiving a radio signal; and
a processor operatively coupled with the transceiver, that:
controls the transceiver to receive a beacon frame including a traffic indication map (TIM) from an access point (AP);
if the TIM indicates that there is a buffered frame for the wireless station, controls the transceiver to transmit a service period poll frame including a duration field of a polled service period, a basic service set identifier (BSSID) field, and a transmitter address (TA) field, wherein the BSSID field indicates an address of the AP, and the TA field indicates an address of the first wireless station, wherein the duration field indicates a time duration used for transmitting a buffered frame by the AP if the service period poll frame is received by the AP, wherein the duration field indicates a time duration used for a Network Allocation Vector (NAV) of a second wireless station that does not transmit the service period poll frame if the service period poll frame is received by the second wireless station;
in response to the service period poll frame, controls the transceiver to receive an ACK message from the AP; and
in response to the ACK message, enters into a doze state.
4. The first wireless station of claim 1 , wherein the processor further:
controls the transceiver to receive an indicator indicating an end of the service period; and
in response to the indicator, enters into the doze state.