Method and apparatus for requesting significant update information from aps within transmission mld in wireless lan system

A receiving multi-link device (MLD) in a wireless local area network (WLAN) system, the receiving MLD comprising:

• a memory;
• a transceiver;
• and
• a processor operatively coupled to the memory and the transceiver,
• wherein processor is configured to:
• transmit a probe request frame to a transmitting MLD through a first link;
• and
• receive a probe response frame from the transmitting MLD through the first link,
• wherein the transmitting MLD includes a first transmitting station (STA) operating on the first link and a second transmitting STA operating on a second link,
• wherein the receiving MLD includes a first receiving STA operating on the first link and a second receiving STA operating on the second link,
• wherein the probe request frame includes a profile field of the second receiving STA,
• wherein the profile field of the second receiving STA includes a first critical update request subfield, and
• wherein when the first receiving STA requests partial information on the second link and the first critical update request field is set to 1, the partial information on the second link is set as critical update information on the second link.

A method in a wireless local area network (WLAN) system, the method comprising:

• receiving, by a transmitting multi-link device (MLD), a probe request frame from a receiving MLD through a first link;
• and
• transmitting, by the transmitting MLD, a probe response frame to the receiving MLD through the first link,
• wherein the transmitting MLD includes a first transmitting station (STA) operating on the first link and a second transmitting STA operating on a second link,
• wherein the receiving MLD includes a first receiving STA operating on the first link and a second receiving STA operating on the second link,
• wherein the probe request frame includes a profile field of the second receiving STA,
• wherein the profile field of the second receiving STA includes a first critical update request subfield, and
• wherein when the first receiving STA requests partial information on the second link and the first critical update request field is set to 1, the partial information on the second link is set as critical update information on the second link.