Section: 6.11.3.2 Mapping to resource elements
Content: If only one CRS port is configured in a cell, the UE may assume that the same antenna port is used for all subframes in an RSS transmission in the cell. Otherwise, the UE may assume that the same antenna port is used for RSS transmission in absolute subframes and and . An RSS is transmitted in consecutive BL/CE DL subframes, starting in the first BL/CE DL subframe in a radio frame satisfying where the RSS periodicity and the RSS time offset are configured by higher layers. In frequency domain, the RSS frequency location is assigned to the 24 subcarriers in the physical resource blocks numbers and , as configured by higher layers. In each subframe used for RSS transmission, the RSS sequence shall be mapped to resource elements in sequence, starting with in increasing order of first the index , over the 24 assigned subcarriers and then the index . A resource element overlapping with resource elements where cell-specific reference signals according to clause 6.10 are transmitted shall not be used for RSS transmission but is counted in the mapping process. Additionally, an RSS subframe is dropped if any RSS PRB pair overlaps with any PRB pair carrying PSS, SSS, PBCH or PDSCH associated with SI-RNTI. In frame structure type 2, those special subframes, indicated as BL/CE DL subframes by higher layer fdd-DownlinkOrTddSubframeBitmapBR, are not counted in RSS mapping and are not used for transmission of RSS.