A wireless communication device, method and product. The device includes a memory and processing circuitry coupled to the memory. The processing circuitry comprises logic and is configured to: process a time synchronization function (TSF) information element (IE) from an access point (AP), the TSF IE including information on a plurality of transmit opportunity (TXOP) slots in a frequency domain and in a time domain, the TXOP slots indicating respective narrowband channels of a wideband channel in the frequency domain for communication with the device; generate a data frame based on the TSF IE; and cause transmission of the data frame over a subset of the TXOP slots, the subset being aggregated over at least one of the frequency domain and the time domain.