Method and apparatus for channel state information (CSI) acquisition with DL and UL reference signals

A base station (BS), comprising:

• a processor configured to generate (i) configuration information for configuring a channel state information reference signal (CSI-RS) and indicating a plurality of higher-layer configured sounding reference signal (SRS) resources, and (ii) downlink control information (DCI) that includes a DCI field for requesting transmission of an aperiodic SRS;
• and
• a transceiver operably connected to the processor, the transceiver configured to:
• transmit, to a UE, the configuration information and the DCI via a downlink (DL) channel and the CSI-RS, and
• receive, from the UE, the requested aperiodic SRS,
• wherein the CSI-RS corresponds to at least one higher-layer configured non-zero-power (NZP) CSI-RS resource,
• wherein the NZP CSI-RS resource is measured to calculate a precoder used for the received SRS, and
• wherein the DCI field is also used to indicate presented of the CSI-RS in a same DL slot as the DCI.

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

• receiving and decoding (i) configuration information for configuring a channel state information reference signal (CSI-RS) and indicating a plurality of higher-layer configured sounding reference signal (SRS) resources blocks in which the SRS is transmitted, and (ii) downlink control information (DCI) that includes a DCI field for requesting an aperiodic SRS transmission;
• and
• receiving the CSI-RS and transmitting the SRS,
• wherein the CSI-RS corresponds to at least one higher-layer configured non-zero-power (NZP) CSI-RS resource,
• wherein the NZP CSI-RS resource is measured to calculate a precoder used for the transmitted SRS, and
• wherein the DCI field is also used to indicate presence of the CSI-RS in a same DL slot as the DCI.