Techniques related to ultra-wide-bandwidth (UWB) transmission mechanisms in wireless communications are described. A device (e.g., an access point (AP)) establishes a basic service set (BSS) on a primary link and a secondary link. The device then performs an aggregated bandwidth operation with one or more stations (STAs). The aggregated bandwidth of the primary link and the secondary link depends on the channel availability of each of the primary link and the secondary link.