6.3.5 Mapping to resource elements

36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS

For each of the antenna ports used for transmission of the physical channel, the block of complex-valued symbols shall conform to the downlink power allocation specified in clause 5.2 in TS 36.213 [4] and be mapped in sequence starting with to resource elements which meet all of the following criteria in the current subframe:

– they are in the physical resource blocks corresponding to the virtual resource blocks assigned for transmission, and

– they are not used for transmission of the core part of PBCH, synchronization signals, and

– they are assumed by the UE not to be used for cell-specific reference signals, where the positions of the cell-specific reference signals are given by clause 6.10.1.2 with the number of antenna ports for and the frequency shift of cell-specific reference signals derived as described in clause 6.10.1.2 4, and

The mapping to resource elements on antenna port not reserved for other purposes shall be in increasing order of first the index over the assigned physical resource blocks and then the index, starting with the first slot in a subframe.

For BL/CE UEs, if the higher layer parameter ce-punctured-subcarriers-DL is configured, then in case of MPDCCH or PDSCH transmission associated with C-RNTI or SPS C-RNTI,

– The parameter ce-punctured-subcarriers-DL indicates the number of subcarriers (1 or 2) and their position (lower or higher edge) to puncture at the downlink narrowband edges:

– If the value is ’00’, then the number of punctured subcarriers on the higher edge of narrowbands above the DC subcarrier is 2 and the number of punctured subcarriers on the higher edge of narrowbands below the DC subcarrier is 1.

– If the value is ’01’, then the number of punctured subcarriers on the higher edge of narrowbands above the DC subcarrier is 1 and the number of punctured subcarriers on the higher edge of narrowbands below the DC subcarrier is 0.

– If the value is ’10’, then the number of punctured subcarriers on the lower edge of narrowbands above the DC subcarrier is 0 and the number of punctured subcarriers on the lower edge of narrowbands below the DC subcarrier is 1.

– If the value is ’11’, then the number of punctured subcarriers on the lower edge of narrowbands above the DC subcarrier is 1 and the number of punctured subcarriers on the lower edge of narrowbands below the DC subcarrier is 2.

– In the mapping to resource elements, when a subcarrier k is punctured according to the above, the resource elements (k,l) shall be counted but not used for transmission.

– The subcarrier puncturing is applied to transmission of the following physical signals and channels when the transmission is aligned with a narrowband edge.

– MPDCCH

– PDSCH

– CSI reference signals

– No subcarrier puncturing is applied to transmissions that are not aligned with a narrowband edge.