For example, an apparatus may be configured to generate, transmit, receive and/or process a frame including a multiple Basic Service Set Identifier (BSSID) element corresponding to a multiple BSSID set including a reporting AP, the BSSID element including one or more non-transmitted BSSID profile elements corresponding to one or more other APs belonging to the multiple BSSID set, wherein a non-transmitted BSSID profile element corresponding to an other AP includes one or more elements of information corresponding to the other AP, and a multi-link element, the multi-link element including one or more profile subelements for one or more reported APs of an other MLD including the other AP, respectively, wherein a profile subelement corresponding to a reported AP includes one or more elements of information corresponding to the reported AP.