Method and device for requesting and receiving information about other ap corresponding to nontransmitted bssid set 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 being operatively connected to the memory and the transceiver,
• wherein the processor is configured to:
• transmit a Multi-Link (ML) probe request frame to a transmitting MLD through a first link;
• and
• receive an ML probe response frame from the transmitting MLD through the first link,
• wherein the transmitting MLD includes first and second transmitting MLD,
• wherein the first transmitting MLD includes a first transmitting station (STA) operating on the first link,
• wherein the second transmitting MLD includes a second transmitting STA operating on the first link and a third transmitting STA operating on the second link,
• wherein the second transmitting STA is a transmitting STA corresponding to a first nontransmitted BSSID of a multiple Basic Service Set IDentifier (BSSID) set based on the first transmitting STA,
• 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 ML probe response frame includes a multiple BSSID element,
• wherein the multiple BSSID element includes a profile of the first nontransmitted BSSID,
• wherein the profile of the first nontransmitted BSSID includes a basic ML element,
• wherein the basic ML element includes a profile subelement of the third transmitting STA, and
• wherein when the first receiving STA requests updated BSS parameter information for the third transmitting STA, the profile subelement of the third transmitting STA includes the updated BSS parameter information for the third transmitting STA.

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

• receiving, by a transmitting multi-link device (MLD), a Multi-Link (ML) probe request frame from a receiving MLD through a first link;
• and
• transmitting, by the transmitting MLD, an ML probe response frame to the receiving MLD through the first link,
• wherein the transmitting MLD includes first and second transmitting MLD,
• wherein the first transmitting MLD includes a first transmitting station (STA) operating on the first link,
• wherein the second transmitting MLD includes a second transmitting STA operating on the first link and a third transmitting STA operating on the second link,
• wherein the second transmitting STA is a transmitting STA corresponding to a first nontransmitted BSSID of a multiple Basic Service Set IDentifier (BSSID) set based on the first transmitting STA,
• 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 ML probe response frame includes a multiple BSSID element,
• wherein the multiple BSSID element includes a profile of the first nontransmitted BSSID,
• wherein the profile of the first nontransmitted BSSID includes a basic ML element,
• wherein the basic ML element includes a profile subelement of the third transmitting STA, and
• wherein when the first receiving STA requests updated BSS parameter information for the third transmitting STA, the profile subelement of the third transmitting STA includes the updated BSS parameter information for the third transmitting STA.