Section: 9.4 Reporting of Precoding Matrix Indicator (PMI)
Content: 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, respectively. 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) is configured for all requirements. The requirements for transmission mode 6, transmission mode 9 with 4 TX and transmission mode 9 with 8 TX alternativeCodebookEnabledCLASSB_K1=TRUE configured 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, PUCCH 1-1 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. The requirements for transmission mode 9 with 16 TX Class A advancedCodebookEnabled=TRUE configured are specified in terms of the ratio In the definition of γ, is [70%] of the maximum throughput obtained at using the precoders configured according to both the PMI and relative power indicator (RPI) reported by the UE, and is the throughput measured at using the precoders configured according to the UE reports PMI and fixed RPI equal to 0.