Method and apparatus for reciprocity based CSI-RS transmission and reception

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

• receiving information about a measurement region that is associated with P ports, where P≥10;
• based on the information,
• identifying the measurement region,
• measuring the P ports associated with the measurement region, and
• determining a channel state information (CSI) report based on the measurement;
• and
• transmitting the CSI report,
• wherein the information about the measurement region includes at least two of (i) a set of physical resource blocks (PRBs), (ii) a set of time slots, and (iii) a set of CSI-reference signal (RS) resources, and
• wherein:
• P×Of=Q, where Q is a number of precoding dimensions,
• Of=a number of precoding dimensions per port associated with the CSI report, and
• Of is fixed, configured, or reported by the UE via UE capability reporting.

A base station (BS) comprising:

• a processor;
• and
• a transceiver operably coupled to the processor, the transceiver configured to:
• transmit information about a measurement region that is associated with P ports, where P≥17;
• and
• receive a channel state information (CSI) report that is based on the P ports associated with the measurement region,
• wherein the information about the measurement region includes at least two of (i) a set of physical resource blocks (PRBs), (ii) a set of time slots, and (iii) a set of CSI-reference signal (RS) resources, and
• wherein:
• P×Of=Q, where Q is a number of precoding dimensions,
• Of=a number of precoding dimensions per port associated with the CSI report, and
• Of is fixed, configured, or reported by a user equipment (UE) via UE capability reporting.