Method for transmitting frame using selective beamforming and apparatus for performing the method

A method for transmitting feedback information by a station (STA), the method comprising:

• receiving, from an access point (AP), an announcement frame including at least one STA information each indicating one of the at least one STA including the STA and at least one partial bandwidth information each indicating at least one frequency resource unit;
• receiving, from the AP, a training frame;
• receiving, from the AP, a polling frame;
• and
• transmitting, to the AP, feedback information for the at least one partial bandwidth information indicated by the announcement frame, wherein the feedback information is generated based on the training frame and is received in response to the polling frame, and
• receiving, from the AP, a multiple-user (MU) physical protocol data unit (PPDU) based on the feedback information,
• wherein the MU PPDU includes a HEW-SIG-A field and a HEW-SIG-B field, and frequency resource unit allocation information is included in the HEW-SIG-B field, and
• wherein the training frame is not based on a channel information between the AP and the at least one STA.

An apparatus of an access point (AP) for receiving feedback information, the apparatus comprising:

• a communicator;
• and
• a processor;
• wherein the processor is configured to:
• cause the communicator to transmit, to at least one station (STA), an announcement frame including at least one STA information each indicating one of the at least one STA and at least one partial bandwidth information each indicating at least one frequency resource unit,
• cause the communicator to transmit, to the at least one STA, a training frame,
• cause the communicator to transmit, to the at least one STA, a polling frame,
• cause the communicator to receive, from the at least one STA, feedback information for the at least one partial bandwidth information indicated by the announcement frame, wherein the feedback information is generated based on the training field and is received in response to the polling frame, and
• cause the communicator to transmit, to the at least one STA, a multiple-user (MU) physical protocol data unit (PPDU) based on the feedback information,
• wherein the MU PPDU includes a HEW-SIG-A field and a HEW-SIG-B field, and frequency resource unit allocation information is included in the HEW-SIG-B field, and
• wherein the training frame is not based on a channel information between the AP and the at least one STA.