Method and apparatus for frequency selective UL precoding

A base station (BS) comprising:

• a processor configured to generate configuration information about resource allocation for an uplink transmission, the configuration information indicating:
• allocated resources for uplink transmission, and
• uplink precoding information for G antenna port groups for the uplink transmission on the allocated resources, wherein the uplink precoding information indicates:
• spatial-domain (SD) basis vectors,
• frequency domain (FD) basis vectors,
• coefficients for (SD, FD) basis vector pairs, and
• two components for the coefficients across the G antenna port groups;
• and
• a transceiver operably coupled to the processor, the transceiver configured to:
• transmit the configuration information;
• and
• receive the uplink transmission on the allocated resources according to the configuration information based on uplink precoding applied for the G antenna port groups and based on the uplink precoding information.

A method for operating a user equipment (UE), the method comprising:

• receiving configuration information about resource allocation for an uplink transmission, the configuration information indicating:
• allocated resources for uplink transmission, and
• uplink precoding information for G antenna port groups for the uplink transmission on the allocated resources, wherein the uplink precoding information indicates:
• spatial-domain (SD) basis vectors,
• frequency domain (FD) basis vectors,
• coefficients for (SD, FD) basis vector pairs, and
• two components for the coefficients across the G antenna port groups;
• based on the uplink precoding information, applying uplink precoding for the G antenna port groups;
• and
• performing uplink transmission on the allocated resources according to the configuration information.