Section: 6.10.3.2 Mapping to resource elements
Content: For antenna port 5, in a physical resource block with frequency-domain index assigned for the corresponding PDSCH transmission, the reference signal sequence shall be mapped to complex-valued modulation symbols with in a subframe according to: Normal cyclic prefix: Extended cyclic prefix: where is the counter of UE-specific reference signal resource elements within a respective OFDM symbol of the PDSCH transmission. The cell-specific frequency shift is given by . The mapping shall be in increasing order of the frequency-domain index of the physical resource blocks assigned for the corresponding PDSCH transmission. The quantity denotes the assigned bandwidth in resource blocks of the corresponding PDSCH transmission. Figure 6.10.3.2-1 illustrates the resource elements used for UE-specific reference signals for normal cyclic prefix for antenna port 5. Figure 6.10.3.2-2 illustrates the resource elements used for UE-specific reference signals for extended cyclic prefix for antenna port 5. The notation is used to denote a resource element used for reference signal transmission on antenna port. Figure 6.10.3.2-1: Mapping of UE-specific reference signals, antenna port 5 (normal cyclic prefix) Figure 6.10.3.2-2: Mapping of UE-specific reference signals, antenna port 5 (extended cyclic prefix) For antenna ports , , , , , , or the antenna ports indicated in Table 6.3.4.4-1 in a physical resource block with frequency-domain index assigned for the corresponding PDSCH transmission, a part of the reference signal sequence shall be mapped to complex-valued modulation symbols in a subframe according to Normal cyclic prefix: where The sequence is given by Table 6.10.3.2-1. Table 6.10.3.2-1: The sequence for normal cyclic prefix Extended cyclic prefix: where The sequence is given by Table 6.10.3.2-2. Table 6.10.3.2-2: The sequence for extended cyclic prefix and for slot/subslot-PDSCH For extended cyclic prefix, UE-specific reference signals are not supported on antenna ports 9 to 14. For slot-PDSCH transmission, the baseline pattern (see 'Baseline' in Figure 6.10.3.2-2A) of UE-specific reference signals is defined as follows. It is applied in MBSFN subframes. where - - - - - - and - if the slot where the PDSCH is transmitted in () fulfils - if the slot where the PDSCH is transmitted in () fulfils The sequence is given by Table 6.10.3.2-2. For slot-PDSCH transmission in normal subframes,is generated as for the baseline slot-PDSCH UE-specific reference signal pattern for the same values of , while is given by and depends on the cell-specific frequency shift as follows (see 'v0', 'v1' and 'v2' in Figure 6.10.3.2-2A for , , and , respectively): - For , , - For , , - For , . Figure 6.10.3.2-2A: Mapping of UE-specific reference signals for slot-PDSCH, antenna ports 7, 8, 9 and 10 (normal cyclic prefix) For subslot-PDSCH transmission, the baseline pattern (see 'Baseline' in Figure 6.10.3.2-2B) of UE-specific reference signals is defined as follows. It is applied if the presence of UE-specific reference signals is indicated in the DCI associated with the subslot-PDSCH (see DMRS position indicator field in TS 36.212[ Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing and channel coding ]  [3]), and in downlink subslots where the baseline pattern, including all the REs associated with if the parameter maxLayersMIMO-STTI is configured with 2 layers, or if the parameter maxLayersMIMO-STTI is configured with 4 layers, has no overlapping resource element with CRS and no overlapping resource element with configured zero-power and non-zero-power CSI reference signals: where The sequence is given by Table 6.10.3.2-2.For subslot-PDSCH transmission in normal subframes, in downlink subslots where the baseline pattern, including all the REs associated with if the parameter maxLayersMIMO-STTI is configured with 2 layers, or if the parameter maxLayersMIMO-STTI is configured with 4 layers, has overlapping resource elements with configured zero-power or non-zero-power CSI reference signals or has overlapping resource elements with CRS, if the presence of UE-specific reference signals is indicated in the DCI associated (see DMRS position indicator field in TS 36.212[ Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing and channel coding ]  [3]) with the subslot-PDSCH, a shifted pattern of UE-specific reference signals is applied. In the shifted pattern,is generated as for the baseline subslot-PDSCH UE-specific reference signal pattern for the same value of , while is given by and depends on the cell-specific frequency shift as follows (see also 'v0','v1' and 'v2' in Figure 6.10.3.2-2B for , , and , respectively): - For , , - For , , - For , , For subslot-PDSCH transmission in MBSFN subframes, in downlink subslots where the baseline pattern, including all the REs associated with if the parameter maxLayersMIMO-STTI is configured with 2 layers, or if the parameter maxLayersMIMO-STTI is configured with 4 layers, has overlapping resource elements with configured zero-power or non-zero-power CSI reference signals, if the presence of UE-specific reference signals is indicated in the DCI associated (see DMRS position indicator field in TS 36.212[ Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing and channel coding ]  [3]) with the subslot-PDSCH, the shifted pattern of UE-specific reference signals for , as defined above, is applied (see 'v0' in Figure 6.10.3.2-2B for ). Figure 6.10.3.2-2B: Mapping of UE-specific reference signals for subslot-PDSCH, antenna ports 7, 8, 9 and 10 (normal cyclic prefix) Resource elements used for transmission of UE-specific reference signals to one UE on any of the antenna ports in the set , where or shall - not be used for transmission of PDSCH on any antenna port in the same slot, and - not be used for UE-specific reference signals to the same UE on any antenna port other than those in in the same slot. Figure 6.10.3.2-3 illustrates the resource elements used for UE-specific reference signals for normal cyclic prefix for antenna ports 7, 8, 9 and 10. Figure 6.10.3.2-4 illustrates the resource elements used for UE-specific reference signals for extended cyclic prefix for antenna ports 7, 8. For BL/CE UEs, if downlink resource reservation is enabled for the UE as specified in [9], and the Resource reservation field in the DCI is set to 1, then in case of PDSCH transmission associated with C-RNTI or SPS C-RNTI using UE-specific MPDCCH search space including PDSCH transmission without a corresponding MPDCCH, - If all OFDM symbols in a PRB are reserved, the demodulation reference signal transmission in that PRB is dropped. Figure 6.10.3.2-3: Mapping of UE-specific reference signals, antenna ports 7, 8, 9 and 10 (normal cyclic prefix) Figure 6.10.3.2-4: Mapping of UE-specific reference signals, antenna ports 7 and 8 (extended cyclic prefix)