Method and apparatus for accessing channel in WLAN system

A access point (AP) supporting channel access of a station (STA) in a wireless communication system, comprising:

• a transceiver;
• and
• a processor that controls the transceiver to:
• transmit, to the STA, a first frame containing a restricted access window (RAW) parameter set element indicating a RAW allowing channel access of the STA;
• receive, from the STA, a second frame within the indicated RAW,
• wherein the RAW is divided into one or more slots,
• wherein the RPS element comprises at least one RAW assignment field,
• wherein each of the at least one RAW assignment field comprises information on a RAW start time, information on a cross slot boundary and information on a slot duration,
• wherein the information on cross slot boundary indicates whether or not crossing a slot boundary is allowed for transmission of the STA.

A method for performing channel access by a station (STA) in a wireless communication system, comprising:

• receiving, from an access point (AP), a first frame containing a restricted access window (RAW) parameter set element indicating a RAW allowing channel access of the STA;
• transmitting, to the AP, a second frame within the indicated RAW,
• wherein the RAW is divided into one or more slots,
• wherein the RPS element comprises at least one RAW assignment field,
• wherein each of the at least one RAW assignment field comprises information on a RAW start time, information on a cross slot boundary and information on a slot duration,
• wherein the information on cross slot boundary indicates whether or not crossing a slot boundary is allowed for transmission of the STA.

A station (STA) in a wireless communication system, comprising:

• a transceiver;
• and
• a processor that controls the transceiver to:
• receive, from an access point (AP), a first frame containing a restricted access window (RAW) parameter set element indicating a RAW allowing channel access of the STA;
• transmit, to the AP, a second frame within the indicated RAW,
• wherein the RAW is divided into one or more slots,
• wherein the RPS element comprises at least one RAW assignment field,
• wherein each of the at least one RAW assignment field comprises information on a RAW start time, information on a cross slot boundary and information on a slot duration,
• wherein the information on cross slot boundary indicates whether or not crossing a slot boundary is allowed for transmission of the STA.