A data unit (e.g., a physical layer convergence procedure (PLCP) protocol data unit (PPDU)) is detected at a first wireless device that is a member of a basic service set (BSS). The data unit was sent on a channel from a second wireless device that is a member of an overlapping basic service set (OBSS). When the first wireless device ignores the data unit and obtains a transmit opportunity for the channel according to a spatial reuse procedure, then the first wireless device is prohibited from transmitting a frame to a device that is a member of the OBSS during the time interval associated with the transmit opportunity.