Precoding matrices for full-power uplink transmissions

An apparatus for wireless communication at a network entity, comprising:

• one or more memories;
• and
• one or more processors, coupled to the one or more memories, configured to:
• transmit, to a user equipment (UE), a configuration of a power mode for transmitting using eight uplink transmission chains, wherein the power mode is one of a full-power mode or a non-full-power mode, and wherein at least a first set of precoding matrices is associated with the full-power mode and at least a second set of precoding matrices is associated with the non-full-power mode;
• transmit, to the UE, an indication of a selected precoding matrix associated with transmitting using the eight uplink transmission chains, wherein the indication is based at least in part on the configuration of the power mode and one of the first set of precoding matrices or the second set of precoding matrices;
• transmit, to the UE, a configuration of a codebook subset, wherein the indication of the selected precoding matrix is further based at least in part on the configuration of the codebook subset, wherein the codebook subset is one of a non-coherent (NC) precoding matrices subset, a partially coherent for two ports (PC-2) precoding matrices subset, or a partially coherent for four ports (PC-4) precoding matrices subset,
• wherein the indication of the selected precoding matrix associated with transmitting using the eight uplink transmission chains includes a rank indicator,
• wherein, when the codebook subset is the NC precoding matrices subset, the first set of precoding matrices is associated with a rank indicator of one through seven,
• wherein, when the codebook subset is the PC-2 precoding matrices subset, the first set of precoding matrices is associated with a rank indicator of one through three, and
• wherein, when the codebook subset is the PC-4 precoding matrices subset, the first set of precoding matrices is associated with a rank indicator of one;
• and
• receive, from the UE, transmission using the eight uplink transmission chains based at least in part on the selected precoding matrix.

A method of wireless communication performed by a user equipment (UE), comprising:

• receiving, from a network entity, a configuration of a power mode for transmitting using eight uplink transmission chains, wherein the power mode is one of a full-power mode or a non-full-power mode, and wherein at least a first set of precoding matrices is associated with the full-power mode and at least a second set of precoding matrices is associated with the non-full-power mode;
• receiving, from the network entity, an indication of a selected precoding matrix associated with transmitting using the eight uplink transmission chains, wherein the indication is based at least in part on the configuration of the power mode and one of the first set of precoding matrices or the second set of precoding matrices;
• receiving, from the network entity, a configuration of a codebook subset, wherein the indication of the selected precoding matrix is further based at least in part on the configuration of the codebook subset, wherein the codebook subset is one of a non-coherent (NC) precoding matrices subset, a partially coherent for two ports (PC-2) precoding matrices subset, or a partially coherent for four ports (PC-4) precoding matrices subset,
• wherein the indication of the selected precoding matrix associated with transmitting using the eight uplink transmission chains includes a rank indicator,
• wherein, when the codebook subset is the NC precoding matrices subset, the first set of precoding matrices is associated with a rank indicator of one through seven,
• wherein, when the codebook subset is the PC-2 precoding matrices subset, the first set of precoding matrices is associated with a rank indicator of one through three, and
• wherein, when the codebook subset is the PC-4 precoding matrices subset, the first set of precoding matrices is associated with a rank indicator of one;
• and
• transmitting using the eight uplink transmission chains based at least in part on the selected precoding matrix.

A method of wireless communication performed by a network entity, comprising:

• transmitting, to a user equipment (UE), a configuration of a power mode for transmitting using eight uplink transmission chains, wherein the power mode is one of a full-power mode or a non-full-power mode, and wherein at least a first set of precoding matrices is associated with the full-power mode and at least a second set of precoding matrices is associated with the non-full-power mode;
• transmitting, to the UE, an indication of a selected precoding matrix associated with transmitting using the eight uplink transmission chains, wherein the indication is based at least in part on the configuration of the power mode and one of the first set of precoding matrices or the second set of precoding matrices;
• transmitting, to the UE, a configuration of a codebook subset, wherein the indication of the selected precoding matrix is further based at least in part on the configuration of the codebook subset, wherein the codebook subset is one of a non-coherent (NC) precoding matrices subset, a partially coherent for two ports (PC-2) precoding matrices subset, or a partially coherent for four ports (PC-4) precoding matrices subset,
• wherein the indication of the selected precoding matrix associated with transmitting using the eight uplink transmission chains includes a rank indicator,
• wherein, when the codebook subset is the NC precoding matrices subset, the first set of precoding matrices is associated with a rank indicator of one through seven,
• wherein, when the codebook subset is the PC-2 precoding matrices subset, the first set of precoding matrices is associated with a rank indicator of one through three, and
• wherein, when the codebook subset is the PC-4 precoding matrices subset, the first set of precoding matrices is associated with a rank indicator of one;
• and
• receiving, from the UE, transmission using the eight uplink transmission chains based at least in part on the selected precoding matrix.