User equipment and wireless communication method

A wireless communication method comprising:

• receiving with a user equipment (UE) from a base station, Zero Power (ZP) Channel State Information-Reference Signal (CSI-RS) resource configuration information;
• and
• receiving, with the UE, a ZP CSI-RS from the BS, wherein the ZP CSI-RS is transmitted as a periodic ZP CSI-RS, a semi-persistent ZP CSI-RS, or an aperiodic ZP CSI-RS,
• wherein when the ZP-CSI-RS is transmitted as the periodic ZP CSI-RS or the semi-persistent ZP-CSI-RS, the ZP CSI-RS resource configuration information designates periodicity and a timing offset for the periodic ZP CSI-RS or the semi-persistent ZP-CSI-RS,
• wherein the receiving receives the ZP CSI-RS based on a ZP CSI-RS resource specified using the periodicity and the timing offset,
• wherein the ZP CSI-RS resource configuration information indicates a location of the ZP CSI- RS in a slot, which is indicated with a location of resource elements in time and frequency domains,
• wherein when the ZP CSI-RS is transmitted as the aperiodic ZP CSI-RS, the UE receives DCI that triggers the aperiodic ZP CSI-RS,
• wherein the UE receives the aperiodic ZP CSI-RS based on a ZP CSI-RS resource specified using the DCI,
• wherein a plurality of the ZP CSI-RS resources of the aperiodic ZP CSI-RS are grouped into a first group and a second group, and
• wherein all of the ZP CSI-RS resources within the first group and all of the ZP CSI-RS resources within the second group are activated/deactivated by being triggered by a common DCI.

A base station (BS) in a wireless communication system comprising:

• a transmitter that transmits, to a user equipment (UE), Zero Power (ZP) Channel State Information-Reference Signal (CSI-RS) resource configuration information, and a ZP CSI-RS,
• wherein the transmitter transmits the ZP CSI-RS as a periodic ZP CSI-RS, a semi-persistent ZP CSI-RS, or an aperiodic ZP CSI-RS,
• wherein when the transmitter transmits the ZP CSI-RS as the periodic ZP CSI-RS or the semi-persistent ZP CSI-RS, the ZP CSI-RS resource configuration information designates periodicity and a timing offset for the periodic ZP CSI-RS or the semi-persistent ZP CSI-RS,
• wherein the ZP CSI-RS resource configuration information indicates a location of the ZP CSI-RS in a slot, which is indicated with a location of resource elements in time and frequency domains,
• wherein when the ZP CSI-RS is transmitted as the aperiodic ZP CSI-RS, the transmitter transmits DCI that triggers the aperiodic ZP CSI-RS,
• wherein the DCI is used, at the UE, to specify a ZP CSI-RS resource to receive the aperiodic ZP CSI-RS,
• wherein a plurality of the ZP CSI-RS resources of the aperiodic ZP CSI-RS are grouped into a first group and a second group, and
• wherein all of the ZP CSI-RS resources within the first group and all of the ZP CSI-RS resources within the second group are activated/deactivated by being triggered by a common DCI.

A wireless communication system comprising:

• a base station (BS) comprising:
• a transmitter that transmits, to a user equipment (UE), Zero Power (ZP) Channel State Information-Reference Signal (CSI-RS) resource configuration information, and a ZP CSI-RS,
• wherein the transmitter transmits the ZP CSI-RS as a periodic ZP CSI-RS, a semi-persistent ZP CSI-RS, or an aperiodic ZP CSI-RS,
• wherein when the transmitter transmits the ZP CSI-RS as the periodic ZP CSI-RS or the semi-persistent ZP CSI-RS, the ZP CSI-RS resource configuration information designates periodicity and a timing offset for the periodic ZP CSI-RS or the semi-persistent ZP CSI-RS,
• wherein the ZP CSI-RS resource configuration information indicates a location of the ZP CSI-RS in a slot, which is indicated with a location of resource elements in time and frequency domains, and
• wherein when the ZP CSI-RS is transmitted as the aperiodic ZP CSI-RS, the transmitter transmits DCI that triggers the aperiodic ZP CSI-RS;
• and
• a user equipment (UE) comprising:
• a receiver that receives, from the BS, the ZP CSI-RS resource configuration information, and the ZP CSI-RS,
• wherein when the ZP CSI-RS is transmitted as the periodic ZP CSI-RS or the semi-persistent ZP CSI-RS, the receiver receives the ZP CSI-RS based on a ZP CSI-RS resource specified using the periodicity and the timing offset,
• wherein when the ZP CSI-RS is transmitted as the aperiodic ZP CSI-RS, the receiver receives DCI that triggers the aperiodic ZP CSI-RS,
• wherein the receiver receives the aperiodic ZP CSI-RS based on a ZP CSI-RS resource specified using the DCI,
• wherein a plurality of the ZP CSI-RS resources of the aperiodic ZP CSI-RS are grouped into a first group and a second group, and
• wherein all of the ZP CSI-RS resources within the first group and all of the ZP CSI-RS resources within the second group are activated/deactivated by being triggered by a common DCI.