Some embodiments of the present disclosure relates to immediate response resource allocation used physical (PHY) layer and Media Access Control (MAC) layer signaling. Some embodiments of the present disclosure provide an apparatus for wireless communications. Apparatus, generally, a first interface configured to obtain a first frame with a PHY header and a MAC payload, on the basis of the instruction provided in the PHY header of the first frame, the first frame including, a processing system configured to determine that it should be sent within a period where there is a response frame to. This device may allow to start to generate and transmit an immediate response before decoding the MAC payload.