9.4 Reporting of Precoding Matrix Indicator (PMI)
36.521-13GPPEvolved Universal Terrestrial Radio Access (E-UTRA)Part 1: Conformance testingRadio transmission and receptionRelease 17TSUser Equipment (UE) conformance specification
The minimum performance requirements of PMI reporting are defined based on the precoding gain, expressed as the relative increase in throughput when the transmitter is configured according to the UE reports compared to the case when the transmitter is using random precoding. When the transmitter uses random precoding, for each PDSCH allocation a precoder is randomly generated and applied to the PDSCH. A fixed transport format (FRC) configured for all requirements.
The requirements for transmission mode 6 and transmission mode 9 and transmission mode 9 with 8 TX alternativeCodebookEnabledCLASSB_K1=TRUE configured with 4 TX are specified in terms of the ratio 
In the definition of γ, for PUSCH 3-1 single PMI and PUSCH 1-2 multiple PMI requirements, 
is 60% of the maximum throughput obtained at 
using random precoding, and 
the throughput measured at 
with precoders configured according to the UE reports.
For the PUCCH 2-1 single PMI requirement, 
is 60% of the maximum throughput obtained at 
using random precoding on a randomly selected full-size subband in set S subbands, and 
the throughput measured at 
with both the precoder and the preferred full-size subband applied according to the UE reports;
For PUSCH 2-2 multiple PMI requirements, 
is 60% of the maximum throughput obtained at 
using random precoding on a randomly selected full-size subband in set S subbands, and 
the throughput measured at 
with both the subband precoder and a randomly selected full-size subband (within the preferred subbands) applied according to the UE reports.
For PUCCH 1-1 single PMI requirement under transmission mode 9 with 4Tx and 8 TX when alternativeCodebookEnabledCLASSB_K1=TRUE configured, 
is 70% of the maximum throughput obtained at 
using the precoders configured according to the UE reports, and 
is the throughput measured at 
with random precoding.
The requirements for transmission mode 9 with 8 TX and transmission mode 9 with 4TX enhanced codebook are specified in terms of the ratio
In the definition of γ, for PUSCH 3-1 single PMI and PUSCH 1-2 multiple PMI requirements, 
is 70% of the maximum throughput obtained at 
using the precoders configured according to the UE reports, and 
is the throughput measured at 
with random precoding.
The requirements for transmission mode 9 with 12 TX, 16 TX, 24TX and 32 TX Class A codebook are specified in terms of the ratio
In the definition of γ, for PUSCH 3-1 single PMI and PUSCH 1-2 multiple PMI requirements, 
is 90% of the maximum throughput obtained at 
using the precoders configured according to the UE reports, and 
is the throughput measured at 
with random precoding.