Section: 9.8.5 PMI reporting with PUCCH 1-1 (CSI Reference Symbol)
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 are specified in terms of the ratio In the definition of γ, tue is 70% of the maximum throughput obtained at SNRfollow using the precoders configured according to the UE reports, and trnd is the throughput measured at SNRfollow with random precoding.