Section: 6.11B.2 Mapping to resource elements
Content: The same antenna port shall be used for all symbols of the MWUS within a subframe. The UE shall not assume that the MWUS is transmitted on the same antenna port as any of the downlink reference signals or synchronization signals. If only one CRS port is configured by the eNB, the UE may assume the transmission of all MWUS subframes is using the same antenna port; otherwise, the UE may assume the same antenna port is used for MWUS transmission in downlink subframes w0 + 2n and w0 + 2n + 1, where w0 is the first downlink subframe of the MWUS transmission as specified in [4], and n=0, 1,…. The MWUS bandwidth is 2 consecutive PRBs, the frequency location of the lowermost PRB with is signaled by higher layers. For both PRB pairs in the frequency domain, for which MWUS is defined, the MWUS sequence shall be mapped to resource elements in sequence, starting with in increasing order of first the index , over the 12 assigned subcarriers and then the index in each subframe in which MWUS is transmitted. The MWUS sequence is mapped to the set of subframes in the actual MWUS duration as defined in [4], where in a subframe in which an MWUS PRB pair overlaps with any PRB pair carrying PSS, SSS, RSS, PBCH or PDSCH associated with SI-RNTI is transmitted, the subframe is counted in the MWUS mapping but not used for transmission of MWUS. In frame structure type 2, those special subframes, indicated as BL/CE DL subframes by higher layer fdd-DownlinkOrTddSubframeBitmapBR, are not counted in MWUS mapping and are not used for transmission of MWUS. A resource element overlapping with resource elements where cell-specific reference signals according to clause 6.10 are transmitted shall not be used for MWUS transmission but is counted in the mapping process.