CSI for non-coherent joint transmission

A method for wireless communications by a user equipment (UE), the method comprising:

• receiving a channel state information (CSI) report configuration, the CSI report configuration associated with one or more CSI reference signal (RS) resources, each CSI-RS resource comprising a set of ports or port groups, wherein the CSI report configuration explicitly configures a single subband size;
• selecting at least two CSI-RS resources or at least one CSI-RS resource with at least two port groups, of the configured CSI-RS resources, for which to report CSI;
• and
• sending a CSI report for the selected at least two CSI-RS resources or the at least one CSI-RS resource with at least two port groups, wherein sending the CSI report comprises:
• determining the UE has insufficient resources for the CSI report with the configured subband size;
• and
• determining to omit at least a portion of the CSI associated with all, or only one, of the at least two CSI-RS resources or the at least one CSI-RS resource with at least two port groups, wherein the portion of the CSI comprises only a subband precoding matrix indicator (PMI) of the CSI-RS resource or port group associated with a weaker channel quality indicator (CQI) or the CSI for either even resource blocks (RBs) or odd RBs.

A method for wireless communications by a base station (BS), comprising:

• providing a user equipment (UE) with a channel state information (CSI) report configuration, the CSI report configuration associated with one or more CSI reference signal (RS) resources, each CSI-RS resource comprising a set of ports or port groups, wherein the CSI report configuration explicitly configures a first subband size, and wherein the CSI report configuration explicitly configures a second subband size or the second subband size is derivable from the first subband size;
• receiving a CSI-RS resource indicator (CRI) from the UE indicating at least one of the one or more CSI-RS resources for which the UE reports CSI;
• and
• determining the first subband size, the second subband size, or both for receiving a CSI report from the UE, wherein the determination is based on at least one of:
• the CRI or sufficiency of available resources at the UE for sending the CSI report.

A method for wireless communications by a base station (BS), comprising:

• providing a user equipment (UE) with a channel state information (CSI) report configuration, the CSI report configuration associated with one or more CSI reference signal (RS) resources, each CSI-RS resource comprising a set of ports or port groups, wherein the CSI report configuration explicitly configures a single subband size;
• receiving a CSI-RS resource indicator (CRI) from the UE indicating at least two CSI-RS resources or at least one CSI-RS resource with at least two port groups, of the configured CSI-RS resources, for which the UE reports CSI;
• and
• determining whether the UE omits at least a portion of the CSI based on the CRI and on whether the UE has sufficient available resources to report the CSI with the configured subband size, wherein the portion of the CSI comprises only a subband precoding matrix indicator (PMI) of the CSI-RS resource or port group associated with a weaker channel quality indicator (CQI) or the CSI for either even resource blocks (RBs) or odd RBs.