Codebook-based uplink transmission in wireless communications

An apparatus, comprising:

• a transceiver capable of wirelessly communicating with a network node of a wireless network;
• and
• a processor coupled to the transceiver, the processor capable of:
• transmitting, via the transceiver, a reporting on a coherence transmission capability of the UE to the network node;
• receiving, via the transceiver, a first signal from a network node of a wireless network, the first signal selecting one or more codewords or a codebook from a plurality of different codebooks within a master codebook as allowed precoders at transmission ranks;
• receiving, via the transceiver, a second signal from the network node, the second signal selecting a precoder among the allowed precoders for uplink (UL) transmission;
• configuring one or more sounding reference signal (SRS) resources and an SRS resource indicator (SRI), transmitted rank indicator (TRI) or transmitted precoding matrix indicator (TPMI) mapping responsive to receiving the first signal and the second signal;
• and
• performing, via the transceiver, an UL transmission of the configured one or more SRS resources and the SRI, TRI or TPMI mapping to the network node,
• wherein signaling overhead of the second signal is affected by the allowed precoders signaled in the first signal.