Description  Claims  Drawing  Cited references 

EP2756711A   [0008] 

DM-RS based Distributed and Localized E-PDCCH structure   [0004] 
Details of association between DMRS ports and EPDCCH transmission   [0005] 
Remaining details on antenna ports   [0006] 
Association between antenna ports and ePDCCH transmissions   [0007]