Method for performing training for signal beamforming in wireless LAN system, and device for same
Presented in the present specification are a method whereby a station performs beamforming training in a wireless LAN (WLAN) system, and a device for same. In particular, presented in the present specification are a method whereby a station performs beamforming training for frequency division multiple access (FDMA) transmission, and a device for same. The method according to the present specification comprises the steps of: transmitting a beamforming setup frame including beamforming training operation information and identification information on one or more second stations corresponding to one FDMA group; performing FDMA beamforming training by using multiple transmission sectors simultaneously on the basis of the beamforming training operation information; receiving a feedback result of the performed FDMA beamforming training from the one or more second stations; and transmitting a selection frame including channel allocation information for each station and FDMA transmission configuration information determined on the basis of the received feedback result.
1. A method for performing, by a first station (STA), beamforming training frequency division multiple access (FDMA) transmission in a wireless Local Area Network (WLAN) system, the method comprising:
transmitting a beamforming setup frame including identification (ID) information of one or more second STAs belonging to one FDMA group and beamforming training operation information;
based on the beamforming training operation information, performing FDMA beamforming training by simultaneously using a plurality of transmission sectors,
wherein the beamforming training operation information comprises beamforming training order information for each combination of the plurality of transmission sectors;
receiving a feedback result of the FDMA beamforming training from the one or more second STAs; and
transmitting a selection frame including FDMA transmission setup information and channel allocation information for each STA that are determined based on the received feedback result.
2. The method of claim 1 , wherein the ID information for the one or more second STAs comprises association identifies (AIDs) of the one or more second STAs or partial AIDs of the one or more second STAs.
3. The method of claim 1 , wherein the beamforming setup frame further comprises:
training type indication information indicating that beamforming training performed based on the beamforming setup frame is a beamforming training process for FDMA; and
channel, resource unit (RU), or bandwidth information corresponding to the identification information of the one or more second STAs.
4. The method of claim 1 , wherein the FDMA beamforming training is performed through transmission of a beam refinement protocol (BRP) frame including a training field.
5. The method of claim 4 , wherein the training field in the BRP frame is transmitted in a duplicated mode for each channel.
6. The method of claim 4 , wherein the training field in the BRP frame is transmitted through a plurality of bonded channels.
7. The method of claim 4 , wherein the plurality of transmission sectors to be used simultaneously is controlled through one radio frequency (RF) chain.
8. The method of claim 4 , wherein the plurality of transmission sectors to be used simultaneously is controlled through RF chains corresponding thereto.
9. The method of claim 1 , further comprising transmitting a poll frame to request a feedback result of the FDMA beamforming training from the one or more second STAs.
10. The method of claim 1 , wherein the FDMA transmission setup information comprises information indicating one or more third STAs participating in FDMA transmission.
11. The method of claim 1 , wherein the first STA corresponds to a personal basic service set central point/access point (PCP/AP).
12. The method of claim 1 , wherein when a fourth STA with a plurality of channels allocated thereto is included in the one or more second STAs, a feedback result received from the fourth STA comprises feedback results for the respective channels allocated to the fourth STA.
13. A station device for performing beamforming training for frequency division multiple access (FDMA) transmission in a wireless Local Area Network (WLAN) system, the device comprising:
a transceiver having one or more radio frequency (RF) chains and configured to transmit and receive signals with one or more other station devices; and
a processor connected to the transceiver to process the signals transmitted and received with the one or more other station devices,
wherein the processor is configured to:
transmit a beamforming setup frame including identification (ID) information of the one or more other STAs belonging to one FDMA group and beamforming training operation information;
based on the beamforming training operation information, perform FDMA beamforming training by simultaneously using a plurality of transmission sectors,
wherein the beamforming training operation information comprises beamforming training order information for each combination of the plurality of transmission sectors;
receive a feedback result of the FDMA beamforming training from the one or more other STAs; and
transmit a selection frame including FDMA transmission setup information and channel allocation information for each STA that are determined based on the received feedback result.