Aspects of the present disclosure provide a mechanism for flexible scheduling of grants for downlink or uplink transmissions. In some examples, a grant may be scheduled using multiple control signals, where subsequent control signals may modify one or more properties of the grant. For example, the grant may be modified to add a packet to the grant for transmission on a different set of time-frequency resources or a different set of multiple-input multiple-output (MIMO) layers, modify a time-frequency resource allocation of the grant, modify the waveform utilized for the grant, modify the transmit-diversity scheme utilized for the grant, or indicate specific processing for the packet.