Method and apparatus for non-codebook based UL transmission

A method comprises:

• receiving a channel state information-reference signal (CSI-RS) resource identifier (CRI) that indicates a resource configuration for CSI-RS for downlink (DL) channel measurement;
• measuring a layer 1 reference signal received power (L1-RSRP) on the CSI-RS;
• transmitting a report of the L1-RSRP measurement to a base station;
• determining a precoding matrix for non-codebook (non-CB) uplink (UL) transmission based on the CRI and the L1-RSRP measurement in response to an UL frequency and a DL frequency being in a same band;
• and
• performing a non-CB UL transmission using the precoding matrix.

An apparatus for wireless communication, the apparatus comprising:

• a transceiver;
• a processor;
• and
• a memory coupled to the processor, the processor configured to cause the apparatus to:
• transmit a channel state information-reference signal (CSI-RS) resource identifier (CRI) that indicates a resource configuration for CSI-RS for downlink (DL) channel measurement;
• receive a report of a layer 1 reference signal received power (L1-RSRP) measurement on the CSI-RS;
• and
• receive a non-codebook (non-CB) uplink (UL) transmission using a precoding matrix, wherein the precoding matrix for the non-CB UL transmission based on the CRI and the L1-RSRP measurement in response to an UL frequency and a DL frequency being in a same band.