Csi codebook parameters and csi reporting for coherent joint transmission

A base station (BS) comprising:

• a transceiver configured to:
• transmit information about (i) a channel state information (CSI) report associated with NTRP≥1 CSI reference signal (CSI-RS) resources and (ii) NL≥1 values of (L1, . . . , LNTRP), where:
• each of the NL values of (L1, . . . , LNTRP) belongs to a table including NTRP, (L1, . . . , LNTRP), and an associated index, and
• (L1, . . . , LNTRP) is a tuple of numbers of spatial-domain (SD) basis vectors Lr associated with CSI-RS resource r=1, . . . , NTRP,
• receive the CSI report that is based on the information.

A method performed by a user equipment (UE), the method comprising:

• receiving information about (i) a channel state information (CSI) report associated with NTRP 1 CSI reference signal (CSI-RS) resources and (ii) NL≥1 values of (L1, . . . , LNTRP), where:
• each of the NL values of (L1, . . . , LNTRP) is indicated based on a table including NTRP, (L1, . . . , LNTRP), and an associated index, and
• (L1, . . . , LNTRP) is a tuple of numbers of spatial-domain (SD) basis vectors Lr associated with CSI-RS resource r=1, . . . , NTRP;
• determining the CSI report based on the information;
• and
• transmitting the determined CSI report.