In accordance with aspects of the disclosure, a method, apparatus, and computer program product are provided for wireless communication. The method, apparatus, and computer program product may be provided for mapping a first signal to one or more resource elements being utilized by a second signal and transmitting the first signal utilizing the resource elements. The method, apparatus, and computer program product may be provided for pre-defining one or more resource blocks in a data region of a frame structure and transmitting an acknowledgement signal in at least one of the pre-defined resource blocks. The method, apparatus, and computer program product may be provided for identifying at least one downlink control channel and transmitting acknowledgment signals in the at least one downlink control channel for a plurality of user equipment.