Section: 10.2.6A.2 Mapping to resource elements
Content: For an NB-IoT carrier which is configured for NPRS transmission, the reference signal sequence shall be mapped to complex-valued modulation symbols used as reference signal for antenna port in slot according to, for Type 1 NPRS: or for Type 2 NPRS: according to higher layer configuration, where - when the higher layer parameter operationModeInfoNPRS for the configured NB-IoT carrier is set to in-band where is signalled by higher layers nprs-SequenceInfo, and if the higher layer parameter nprs-SequenceInfo indicates is odd, and if the higher layer parameter nprs-SequenceInfo indicates is even. - when the higher layer parameter operationModeInfoNPRS for the configured NB-IoT carrier is set to standalone or guard-band and where . If is not configured by higher layers, . The number of PBCH antenna ports is signalled by higher layers. If higher layer parameter nprsBitmap is not configured, resource elements in OFDM symbols 5 and 6 in each slot shall not be used for transmission of NPRS. If the configured periodicity of Type 1 NPRS is equal to that of Type 2 NPRS, the UE is not expected to be configured with overlapped resource elements between Type 1 NPRS and Type 2 NPRS. Otherwise, a resource element configured for Type 1 NPRS shall not be used for Type 2 NPRS. Figure 10.2.6A.2-1: Mapping of NPRS (operationModeInfoNPRS is set to in-band, nprsBitmap configured) Figure 10.2.6A.2-2: Mapping of NPRS (operationModeInfoNPRS is set to standalone or guard-band, nprsBitmap configured)