Section: 6.2.4A Enhanced Resource-Element Groups (EREGs)
Content: EREGs are used for defining the mapping of enhanced control channels to resource elements. There are 16 EREGs, numbered from 0 to 15, per physical resource block pair. Number all resource elements, except resource elements carrying DM-RS for antenna ports for normal cyclic prefix or for extended cyclic prefix, in a physical resource-block pair cyclically from 0 to 15 in an increasing order of first frequency, then time. All resource elements with number in that physical resource-block pair constitutes EREG number . For frame structure type 3, if the higher layer parameter subframeStartPosition indicates 's07' and the downlink transmission starts in the second slot of a subframe, the above definition applies to the second slot of that subframe instead of the first slot.