FIG. 6 is a diagram illustrating EPDCCH transmissions in a DL subframe;

FIG. 7 is a diagram illustrating an allocation of ECCEs for localized EPDCCH transmissions;

FIG. 8 is a diagram illustrating a transmission of two EPDCCHs through spatial multiplexing using same ECCEs;

FIG. 9 is a diagram illustrating an implicit PUCCH resource determination for HARQ-ACK transmission in response to a localized EPDCCH detection by a UE;

FIG. 10 is a diagram illustrating a process for UEs to determine PUCCH resources for transmissions of HARQ-ACK signals in response to detecting respective PDCCHs, distributed EPDCCHs, or localized EPDCCHs, according to an embodiment of the present invention;

FIG. 11 is a diagram illustrating a use of an EPCFICH to indicate PRBs used for distributed and for localized EPDCCH transmissions in a subframe, according to an embodiment of the present invention;

FIG. 12 is a diagram illustrating a process for a UE to determine whether a PRB configured for EPDCCH transmission is used for EPDCCH transmission or for PDSCH transmission in a subframe depending on a detected EPCFICH value, according to an embodiment of the present invention;

FIG. 13 is a diagram illustrating a PUCCH resource determination for HARQ-ACK signal transmission in response to an EPDCCH detection, according to an embodiment of the present invention;