In codebook-based uplink shared-channel transmission, the network selects the transmission rank and the corresponding precoding matrix and informs the device through uplink scheduling grant. At the UE side, the precoding matrix is applied to the scheduled PUSCH transmission and the indicated number of layers is mapped to the antenna ports. To select a suitable rank and a corresponding precoding matrix, the gNB needs estimates of the channels between the device antenna ports and the corresponding network receive antennas. To enable this, a UE configured for codebook-based PUSCH transmission would typically be configured for transmission of at least one multi-port SRS. Based on measurements on the configured SRS, the network can estimate the ...
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