Apparatus and method for channel access

A method by a station (STA) for a fast sector discovery in a wireless local access network (WLAN), the method comprising:

• receiving, from an access point (AP), at least one No Data Protocol (NDP) type frame for sector training, wherein each of the at least one NDP type frame includes a Short Training Field (STF) field, a Long Training Field (LTF) field, and a signal field (SIG) without a Data field;
• and
• transmitting, to the AP, a feedback frame including a sector identification (ID) indicating a sector selected by the STA,
• wherein the at least one NDP type frame is received in a sector training type restricted access window (RAW), and
• wherein the sector training type RAW is distinguished from other types of RAW including a general type RAW for general data transmission.

An apparatus for a station (STA) for a fast sector discovery in a wireless local access network (WLAN), the apparatus comprising:

• a transmitter;
• a receiver;
• and
• a processor,
• wherein the processor is configured to:
• receive, using the receiver, from an access point (AP), at least one No Data Protocol (NDP) type frame for sector training, wherein each of the at least one NDP type frame includes a Short Training Field (STF) field, a Long Training Field (LTF) field, a Signal (SIG) field without a Data field;
• and
• transmitting, using the transmitter, to the AP, a feedback frame including a sector identification (ID) indicating a sector selected by the STA,
• wherein the at least one NDP type frame is received in a sector training type restricted access window (RAW), and
• wherein the sector training type RAW is distinguished from other types of RAW including a general type RAW for general data transmission.