Method and apparatus for aperiodic reference signal transmission and reception

A base station (BS), the BS comprising:

• a processor configured to generate an aperiodic channel state information reference signal (CSI-RS) configuration information and a downlink control information (DCI);
• and
• a transceiver, operably connected to the processor, the transceiver configured to:
• transmit the aperiodic CSI-RS configuration information including a CSI-RS triggering offset;
• transmit the DCI via a physical downlink control channel (PDCCH), wherein the DCI triggers an aperiodic CSI-RS;
• and
• transmit the aperiodic CSI-RS in a slot Ks,
• wherein the CSI-RS triggering offset is configured from a first set when μPDCCH<μCSIRS, and from a second set when μPDCCH>μCSIRS, where μPDCCH and μCSIRS are subcarrier spacing configurations for the PDCCH and the aperiodic CSI-RS, respectively, and
• wherein the slot Ks is determined based on the CSI-RS triggering offset, a slot containing the triggering DCI, and the subcarrier spacing configurations (μPDCCH and μCSIRS).

A method for operating a user equipment (UE) for aperiodic channel state information reference signal (CSI-RS) reception, the method comprising:

• receiving aperiodic CSI-RS configuration information including a CSI-RS triggering offset;
• receiving downlink control information (DCI) via a physical downlink control channel (PDCCH), wherein the DCI triggers the aperiodic CSI-RS;
• and
• determining the CSI-RS triggering offset based on the CSI-RS configuration information, wherein:
• the CSI-RS triggering offset is configured from a first set when μPDCCH<μCSIRS, and
• the CSI-RS triggering offset is configured from a second set when μPDCCH>μCSIRS,
• wherein μPDCCH and μCSIRS are subcarrier spacing configurations for the PDCCH and the aperiodic CSI-RS, respectively;
• and
• receiving the aperiodic CSI-RS in a slot Ks determined based on the CSI-RS triggering offset, a slot containing the triggering DCI, and the subcarrier spacing configurations (μPDCCH and μCSIRS).