The present invention relates to rapid search space reconfiguration for E-PDCCH (Enhanced Physical Downlink Control CHannel) in wireless communication system to avoid flashlight interferences from neighbouring cells and to allocate the E-PDCCH on the best physical resource blocks (PRBs) in frequency fluctuation dominated scenarios. To this end, a method for providing low-latency feedback on a reconfiguration attempt of a search space for an Enhanced-PDCCH, and a corresponding apparatus are provided. Specifically, a signalling scheme is provided that supports transmission of both HARQ-ACK for PDCCH based E-PDCCH reconfiguration and HARQ-ACK for PDSCH (Physical Downlink Shared CHannel) on the same uplink subframe, so that an acknowledgment of PDCCH based E-PDCCH reconfiguration information and PDSCH information can be transmitted on the same subframe.