METHOD AND APPARATUS HAVING OPTIMIZED SIGNALING THROUGH ML PROBE REQUEST FRAME IN ORDER TO PREVENT DUPLICATE RECEPTION OF IMPORTANT UPDATE INFORMATION IN WIRELESS LAN SYSTEM

A method and an apparatus having optimized signaling through a multi-link (ML) probe request frame in order to prevent duplicate reception of important update information in a wireless LAN system are presented. Particularly, a reception MLD transmits an ML probe request frame to a transmission MLD through a first link. The reception MLD receives an ML probe response frame from the transmission MLD through the first link. The ML probe request frame includes a profile sub-element of a second transmission STA. The profile sub-element of the second transmission STA includes a critical update requested sub-field and an inclusion flag sub-field. When a first reception STA requests important update information for the second transmission STA, the value of the critical update requested sub-field is set to 1, and the profile sub-element of the second transmission STA further includes a last known BPCC sub-field.