Method for transmitting and receiving frame performed by station operating in power save mode in wireless local area network system and apparatus for the same
A method for a wireless local area network, the method performed by a station includes receiving a beacon frame from an access point (AP), the beacon frame including a Traffic Indication Map (TIM) element indicating that the AP has a buffered frame for the station; transmitting a power save (PS)-poll frame and at least one duplicated PS-poll frame to the AP on a first 20 MHz channel and at least one second 20 MHz channel, the PS poll frame being transmitted on the first 20 MHz channel, the at least one duplicated PS poll frame being transmitted on the at least one second 20 MHz channel; and receiving the buffered frame from the AP as a response of at least one of the PS poll frame and the at least one duplicated PS poll frame.
1. A method for a wireless local area network, the method performed by a station and comprising:
receiving a beacon frame from an access point (AP), the beacon frame including a Traffic Indication Map (TIM) element indicating that the AP has a buffered frame for the station;
generating at least one duplicated power save (PS)-poll frame by duplicating a PS-poll frame;
transmitting the PS poll frame and the at least one duplicated PS-poll frame to the AP on a first 20 MHz channel and at least one second 20 MHz channel, the PS poll frame being transmitted on the first 20 MHz channel, the at least one duplicated PS poll frame being transmitted on the at least one second 20 MHz channel; and
receiving the buffered frame from the AP as a response of at least one of the PS poll frame and the at least one duplicated PS poll frame,
wherein a bandwidth used to receive the buffered frame is equal to or smaller than an entire bandwidth in which all of the PS poll frame and the at least one duplicated PS poll frame are transmitted.
2. The method of claim 1 , wherein the PS-poll frame and the at least one duplicated PS-poll frame respectively comprise a data field that is scrambled based on a scrambling sequence that represents the entire bandwidth in which all of the PS poll frame and the at least one duplicated PS poll frame are transmitted.
3. The method of claim 2 , wherein the data field includes a transmitter address field set to a value which indicates that the scrambling sequence relates to the entire bandwidth in which all of the PS poll frame and the at least one duplicated PS poll frame are transmitted.
4. The method of claim 1 , wherein the number of the at least one second 20 MHz channel is one, and the first 20 MHz channel is contiguous with the second 20 MHz channel.
5. The method of claim 1 , wherein the number of the at least one second 20 MHz channel is three.
6. The method of claim 1 , wherein the number of the at least one second 20 MHz channel is seven.
7. A device for a wireless local area network, the device comprising:
a transceiver configured to transmit and receive radio signals; and
a processor operatively coupled with the transceiver and configured to:
instruct the transceiver to receive a beacon frame from an access point (AP), the beacon frame including a Traffic Indication Map (TIM) element indicating that the AP has a buffered frame for the device;
generate at least one duplicated power save (PS)-poll frame by duplicating a PS-poll frame;
instruct the transceiver to transmit the PS-poll frame and the at least one duplicated PS-poll frame to the AP on a first 20 MHz channel and at least one second 20 MHz channel, the PS poll frame being transmitted on the first 20 MHz channel, the at least one duplicated PS poll frame being transmitted on the at least one second 20 MHz channel; and
instruct the transceiver to receive the buffered frame from the AP as a response of at least one of the PS poll frame and the at least one duplicated PS poll frame,
wherein a bandwidth used to receive the buffered frame is equal to or smaller than an entire bandwidth in which all of the PS poll frame and the at least one duplicated PS poll frame are transmitted.
8. The device of claim 7 , wherein the PS-poll frame and the at least one duplicated PS-poll frame respectively comprise a data field that is scrambled based on a scrambling sequence that represents the entire bandwidth in which all of the PS poll frame and the at least one duplicated PS poll frame are transmitted.
9. The device of claim 8 , wherein the data field includes a transmitter address field set to a value which indicates that the scrambling sequence relates to the entire bandwidth in which all of the PS poll frame and the at least one duplicated PS poll frame are transmitted.
10. The device of claim 7 , wherein the number of the at least one second 20 MHz channel is one, and the first 20 MHz channel is contiguous with the second 20 MHz channel.
11. The device of claim 7 , wherein the number of the at least one second 20 MHz channel is three.
12. The device of claim 7 , wherein the number of the at least one second 20 MHz channel is seven.