Section: 10.2.7.2.2 Mapping to resource elements
Content: The same antenna port shall be used for all symbols of the narrowband secondary synchronization signal within a subframe. The UE shall not assume that the narrowband secondary synchronization signal is transmitted on the same antenna port as any of the downlink reference signals. The UE shall not assume that the transmissions of the narrowband secondary synchronization signal in a given subframe use the same antenna port, or ports, as the narrowband secondary synchronization signal in any other subframe. If indicated by higher layer, a UE may assume different precoders are applied for NSSS transmission in a number of consecutive NSSS occasions signalled by higher layer. The 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 over the assigned last symbols of subframe 9 for frame structure type 1 or subframe 0 for frame structure type 2 in radio frames fulfilling , where is given by Table 10.2.7.2.2-1. Table 10.2.7.2.2-1: NSSS number of symbols For resource elements overlapping with resource elements where cell-specific reference signals according to clause 6.10 are transmitted, the corresponding sequence element is not used for the NSSS but counted in the mapping process.