5.3.2A Layer mapping
36.2113GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Physical channels and modulationRelease 17TS
The complex-valued modulation symbols for each of the codewords to be transmitted are mapped onto one or two layers. Complex-valued modulation symbols 
for codeword 
shall be mapped onto the layers 
, 
where 
is the number of layers and 
is the number of modulation symbols per layer.
5.3.2A.1 Layer mapping for transmission on a single antenna port
For transmission on a single antenna port, a single layer is used, 
, and the mapping is defined by
with 
.
5.3.2A.2 Layer mapping for spatial multiplexing
For spatial multiplexing, the layer mapping shall be done according to Table 5.3.2A.2-1. The number of layers 
is less than or equal to the number of antenna ports 
used for transmission of the physical uplink shared channel.
The case of a single codeword mapped to multiple layers is only applicable when the number of antenna ports used for PUSCH is four, except for slot-PUSCH and subslot-PUSCH transmission where a single codeword is used irrespective of the number of layers.
Table 5.3.2A.2-1: Codeword-to-layer mapping for spatial multiplexing
|
Number of layers |
Number of codewords |
Codeword-to-layer mapping
|
|
|
1 |
1 |
|
|
|
2 |
1 |
|
|
|
2 |
2 |
|
|
|
|
|||
|
3 |
2 |
|
|
|
4 |
2 |
|
|
|
|
|||
|
41 |
11 |
|
|
|
NOTE 1: Only used for slot-PUSCH and subslot-PUSCH |
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