When the EPCFICH value is ‘01’ 1150, only PRBs 1160 and 1164 are used for localized EPDCCH transmissions while, although configured for potential localized EPDCCH transmissions, PRBs 1162 and 1166 are indicated by the EPCFICH that they are not used. The numbering of LCCEs changes relative to the case that the EPCFICH value is ‘10’ to consider only the PRBs indicated by the EPCFICH value of ‘01’ for localized EPDCCH transmissions. An EPCFICH value of ‘00’ may indicate that only PRBs 1110 and 1112 are used for EPDCCH transmissions in the respective subframe (only distributed EPDCCH transmissions exist in the minimum set of PRBs). An EPCFICH value of ‘11’ may indicate that PRBs 1110, 1112, 1114, and 1116 are used for distributed EPDCCH transmissions and PRBs 1160 and 1164 are used for localized EPDCCH transmissions in the respective subframe.

By adjusting the configured set of PRBs for distributed and localized EPDCCH transmissions per subframe, the PUCCH resources corresponding to EPDCCH detections associated with a PDSCH are also adjusted per subframe. This is beneficial in further reducing the associated PUCCH overhead.

In order to reduce the signaling overhead required for indicating to a UE the PRBs used for a PDSCH transmission, this indication can be in RBGs, where an RBG consists of multiple PRBs and, depending on the allocation type, a UE may be allocated multiple RBGs, instead of multiple PRBs, for a PDSCH transmission. When an RBG includes a PRB configured for EPDCCH transmissions, a UE is indicated PDSCH reception in the reference